Grades 9-12
Free High School Worksheets (Grades 9-12)
Printable worksheets for grades 9 through 12 across Math, Science, Language Arts, and Social Studies. Each worksheet includes a student version and a complete answer key.
Calculus, Applications of Derivatives, Optimization
Using derivatives to maximize and minimize quantities
Grade 9-12 · 15 problems
Calculus, Applications of Integration, Area Between Curves
Set up and evaluate definite integrals to find enclosed area
Grade 9-12 · 15 problems
Calculus, Derivative Rules, Power, Chain, Product, Quotient
Practice finding derivatives with the main differentiation rules
Grade 9-12 · 15 problems
Calculus, Evaluating Limits Algebraically
Using substitution, factoring, rationalizing, and limit laws
Grade 9-12 · 15 problems
Calculus, Riemann Sums and the Definite Integral
Approximating area and connecting sums to integrals
Grade 9-12 · 15 problems
Circle Theorems and Arc Length
Using angles, chords, tangents, and arc measures in circles
Grade 9-12 · 15 problems
Conditional and Independent Probability
Finding probabilities with dependent and independent events
Grade 9-12 · 15 problems
Conic Sections, Circles and Ellipses
Writing equations and analyzing key features
Grade 9-12 · 15 problems
Coordinate Geometry, Distance and Midpoint
Finding lengths and middle points on the coordinate plane
Grade 9-12 · 12 problems
Derivatives and Differentiation Rules
Applying basic rules to find rates of change
Grade 9-12 · 15 problems
Determinants and Cramer's Rule
Solving linear systems with matrices
Grade 9-12 · 12 problems
Exponential Functions and Growth
Modeling patterns of repeated multiplication
Grade 9-12 · 15 problems
Factoring Polynomials
Factoring expressions using common factors, trinomials, and special patterns
Grade 9-12 · 15 problems
Geometry, Transformations
Translations, reflections, rotations, dilations, and composition of transformations
Grade 9-12 · 15 problems
Graphing Linear and Systems of Equations
Plot lines, identify slope, and solve systems by graphing
Grade 9-12 · 15 problems
Integration and the Fundamental Theorem of Calculus
Finding antiderivatives and evaluating definite integrals
Grade 9-12 · 15 problems
Integration by Parts and Substitution
Choosing and applying two core integration techniques
Grade 9-12 · 12 problems
Introduction to Proof, Direct and Indirect
Writing logical arguments using direct proof and proof by contradiction
Grade 9-12 · 12 problems
Inverse Functions and Compositions
Finding inverses and evaluating composed functions
Grade 9-12 · 12 problems
Law of Sines and Cosines
Solving oblique triangles with side and angle relationships
Grade 9-12 · 15 problems
Linear Equations
Solve one- and two-step equations, graph lines, and interpret slope and intercept.
Grade 9-12 · 8 problems
Linear Programming and Optimization
Model constraints, find feasible regions, and optimize objective functions
Grade 9-12 · 12 problems
Math, Completing the Square
Rewrite quadratic expressions and solve quadratic equations
Grade 9-12 · 15 problems
Math, Complex Numbers and the Imaginary Unit
Working with i, simplifying powers, and performing operations with complex numbers
Grade 9-12 · 15 problems
Math, Conic Sections, Hyperbolas and Parabolas
Graphing, standard forms, foci, directrices, and asymptotes
Grade 9-12 · 12 problems
Math, Domain, Range, and Graphs of Functions
Finding domain and range from equations, graphs, and tables
Grade 9-12 · 15 problems
Math, Eigenvalues and Eigenvectors
Finding special directions and scale factors for matrices
Grade 9-12 · 10 problems
Math, Euler's Method for Differential Equations
Approximating solutions to differential equations step by step
Grade 9-12 · 10 problems
Math, First-Order Linear Differential Equations
Solving linear differential equations with integrating factors
Grade 9-12 · 12 problems
Math, Hyperbolic Functions and Their Inverses
Using definitions, identities, graphs, and inverse functions
Grade 9-12 · 12 problems
Math, Improper Integrals and Convergence Tests
Evaluating improper integrals and deciding convergence
Grade 9-12 · 12 problems
Math, Limits and Continuity
Evaluating limits and identifying continuity
Grade 9-12 · 15 problems
Math, Logarithms and Exponential Equations
Using logarithms to rewrite, evaluate, and solve exponential relationships
Grade 9-12 · 15 problems
Math, Logic and Truth Tables
Evaluating statements with logical operators
Grade 9-12 · 15 problems
Math, Parametric Equations and Polar Coordinates
Connecting parametric forms, polar forms, and Cartesian graphs
Grade 9-12 · 15 problems
Math, Partial Fractions and Integration
Decompose rational functions and use them to evaluate integrals
Grade 9-12 · 12 problems
Math, Pascal's Triangle and the Binomial Theorem
Expanding binomials and finding coefficients
Grade 9-12 · 12 problems
Math, Permutations and Combinations
Counting outcomes with order and selection
Grade 9-12 · 15 problems
Math, Precalculus, Polar Coordinates and Graphs
Convert, interpret, and graph equations in polar form
Grade 9-12 · 15 problems
Math, Quadratic Formula Tune Practice
Practice using the quadratic formula to solve quadratic equations
Grade 9-12 · 12 problems
Math, Slope Fields and Direction Fields
Visualizing differential equations with slopes
Grade 9-12 · 10 problems
Math, Systems of Inequalities
Solving and graphing systems of linear inequalities
Grade 9-12 · 15 problems
Math, Taylor and Maclaurin Series
Approximating functions with polynomials
Grade 9-12 · 12 problems
Math, Trigonometric Sum, Difference, and Double-Angle Identities
Use identities to simplify, evaluate, and solve trigonometric expressions
Grade 9-12 · 12 problems
Math, Unit Circle and Trigonometry
Using angles, coordinates, and trig values on the unit circle
Grade 9-12 · 15 problems
Math, Vectors and Vector Operations
Adding, subtracting, scaling, and interpreting vectors
Grade 9-12 · 15 problems
Matrix Operations and Solving Systems
Practice with matrix arithmetic, determinants, inverses, and system solving
Grade 9-12 · 15 problems
Normal Distribution and Probability
Using mean, standard deviation, and z-scores to find probabilities
Grade 9-12 · 15 problems
Piecewise and Step Functions
Evaluating, graphing, and modeling functions with intervals
Grade 9-12 · 12 problems
Polynomial Operations
Adding, subtracting, and multiplying polynomials
Grade 9-12 · 15 problems
Power Series and Radius of Convergence
Using ratio tests, centers, and endpoints
Grade 9-12 · 12 problems
Precalculus Vectors, Magnitude, Direction, and Operations
Finding vector length, angle, components, sums, and products
Grade 9-12 · 15 problems
Precalculus, Arithmetic and Geometric Sequences
Finding terms, formulas, and sums for common sequence patterns
Grade 9-12 · 15 problems
Precalculus, Exponential and Logarithmic Functions
Solving, graphing, and modeling with exponentials and logarithms
Grade 9-12 · 15 problems
Precalculus, Parametric Equations
Graphing, interpreting, and converting parametric relationships
Grade 9-12 · 15 problems
Precalculus, Rational Functions and Asymptotes
Analyze vertical, horizontal, slant asymptotes, holes, and key graph features
Grade 9-12 · 15 problems
Precalculus, Trigonometric Identities
Simplifying, verifying, and applying trigonometric identities
Grade 9-12 · 15 problems
Probability and Counting Principles
Using counting methods to find probabilities
Grade 9-12 · 15 problems
Quadratic Equations
Solving and analyzing quadratic equations
Grade 9-12 · 15 problems
Quadratic Functions and Parabolas
Graphing, analyzing, and solving quadratic relationships
Grade 9-12 · 15 problems
Rational Expressions and Equations
Simplifying, combining, and solving with rational expressions
Grade 9-12 · 15 problems
Separable First-Order Differential Equations
Solving differential equations by separating variables
Grade 9-12 · 12 problems
Sequences and Series, Arithmetic and Geometric
Finding patterns, rules, terms, and sums
Grade 9-12 · 15 problems
Systems of Equations
Solving pairs of linear equations
Grade 9-12 · 15 problems
Trigonometry Right Triangles
Using sine, cosine, and tangent in right triangles
Grade 9-12 · 15 problems
Which Trig Functions Are Positive per Quadrant Practice
Use quadrant signs to identify positive trigonometric functions
Grade 9-12 · 12 problems
Accuracy vs Precision, Percent Error and Sources of Uncertainty
Evaluating measurements, calculations, and experimental reliability
Grade 9-12 · 15 problems
Claims from Graphs, Correlation vs Causation
Evaluate evidence and avoid overclaiming from data
Grade 9-12 · 15 problems
Climate Change Evidence Across Scientific Disciplines
Connecting evidence from the atmosphere, oceans, ice, ecosystems, and geology
Grade 9-12 · 15 problems
Designing a Controlled Experiment
Planning fair tests with variables, controls, and evidence
Grade 9-12 · 15 problems
Engineering Design Process Applied to Science Problems
Use criteria, constraints, testing, and iteration to solve real science challenges
Grade 9-12 · 15 problems
Forensic Science Basics, DNA Fingerprints and Chromatography
Using DNA patterns and chemical separation to analyze evidence
Grade 9-12 · 15 problems
Identifying Pseudoscience Bias and Logical Fallacies
Evaluating scientific claims, evidence, bias, and reasoning
Grade 9-12 · 15 problems
Microscope Skills, Magnification and Specimen Preparation
Using compound microscopes, calculating magnification, and preparing clear specimens
Grade 9-12 · 15 problems
Reading a Scientific Abstract and Identifying Claims
Finding claims, evidence, scope, and limits in scientific summaries
Grade 9-12 · 15 problems
Reading Scientific Figures and Captions
Interpreting data displays, labels, captions, and visual evidence
Grade 9-12 · 15 problems
Science, Biotechnology and Bioethics CRISPR, Cloning, and GMOs
Exploring gene editing, cloning, genetically modified organisms, and ethical decision-making
Grade 9-12 · 15 problems
Science, Climate Modeling, Running Simulations
Using simulations to test climate variables and interpret model results
Grade 9-12 · 12 problems
Science, Comparing Simulation Models and Real Data
Evaluating how well models match observations
Grade 9-12 · 15 problems
Science, Dimensional Analysis Across Disciplines
Using units to solve problems in science
Grade 9-12 · 15 problems
Science, Engineering Ethics in Scientific Projects
Evaluating safety, honesty, fairness, and responsibility in engineering decisions
Grade 9-12 · 15 problems
Science, Graphing Scientific Data Choosing the Right Chart Type
Selecting effective charts for experimental results
Grade 9-12 · 15 problems
Science, Interpreting Scatter Plots and Linear Regressions
Using data trends, best-fit lines, slopes, and residuals in science investigations
Grade 9-12 · 15 problems
Science, Lab Safety Rules, MSDS Sheets, and Emergency Procedures
Using safety rules, chemical safety information, and emergency response steps
Grade 9-12 · 15 problems
Science, Modeling Feedback Loops in Systems
Identifying, diagramming, and predicting system behavior
Grade 9-12 · 15 problems
Science, Reading Data Tables and Drawing Evidence-Based Conclusions
Using patterns, comparisons, and evidence to support scientific claims
Grade 9-12 · 15 problems
Science, Renewable vs Non Renewable Energy Sources
Comparing energy sources, impacts, and tradeoffs
Grade 9-12 · 15 problems
Science, Scientific Notation and Order of Magnitude Estimation
Using powers of ten to describe and estimate scientific quantities
Grade 9-12 · 15 problems
Science, SI Units Metric Prefixes and Unit Conversions
Practice converting measurements using SI units and metric prefixes
Grade 9-12 · 15 problems
Science, Writing a Formal Lab Report
Organizing evidence, analysis, and conclusions in scientific writing
Grade 9-12 · 15 problems
Scientific Method for High School Investigations
Designing, testing, analyzing, and communicating scientific investigations
Grade 9-12 · 15 problems
Significant Figures and Rounding in Scientific Measurements
Practice reporting measurements with the correct precision
Grade 9-12 · 15 problems
Advanced Grammar, Mechanics and Syntax
Refining punctuation, sentence structure, and clarity
Grade 9-12 · 15 problems
AP Language, Argument Essay Strategies
Building defensible claims, evidence, reasoning, and commentary
Grade 9-12 · 15 problems
AP Language, Rhetorical Analysis
Analyzing rhetorical choices, audience, purpose, and effect
Grade 9-12 · 15 problems
AP Literature, Analyzing Poetry
Close reading of poetic language, structure, and meaning
Grade 9-12 · 15 problems
AP Literature, Drama and Tragic Structure
Analyzing tragedy, dramatic form, and literary meaning
Grade 9-12 · 15 problems
Language Arts, Allegory and Extended Metaphor
Identifying symbolic meaning and sustained comparison in texts
Grade 9-12 · 12 problems
Language Arts, AP Language, Synthesis Essay Skills
Building defensible claims, using sources, and writing commentary
Grade 9-12 · 12 problems
Language Arts, AP Literature, Analyzing Prose Fiction
Close reading of narration, style, characterization, and theme
Grade 9-12 · 15 problems
Language Arts, Author Study, Langston Hughes and the Jazz Age
Exploring poetry, identity, music, and the Harlem Renaissance
Grade 9-12 · 10 problems
Language Arts, Author Study, Shakespeare's Sonnets and Devices
Analyzing structure, imagery, figurative language, and themes in Shakespearean sonnets
Grade 9-12 · 10 problems
Language Arts, Bibliography and MLA Citation Practice
Practice creating MLA Works Cited entries and in-text citations
Grade 9-12 · 12 problems
Language Arts, College Essay Writing
Planning, drafting, and revising a personal college essay
Grade 9-12 · 15 problems
Language Arts, Debate, Cross-Examination and Rebuttal Practice
Building clear questions, strategic answers, and effective rebuttals
Grade 9-12 · 15 problems
Language Arts, Expository Essay Writing
Organizing clear explanations with evidence and structure
Grade 9-12 · 10 problems
Language Arts, Journalism, Writing the Inverted Pyramid
Lead with the most important facts and organize news clearly
Grade 9-12 · 10 problems
Language Arts, Literary Analysis
Analyzing theme, character, tone, structure, and evidence
Grade 9-12 · 15 problems
Language Arts, Literary Theory, Marxist and Historical Criticism
Analyzing literature through class, power, and historical context
Grade 9-12 · 15 problems
Language Arts, Mythology and Allusion
Recognizing and interpreting references from myth
Grade 9-12 · 12 problems
Language Arts, Nonfiction Argument and Evidence
Identifying claims, reasons, and supporting evidence in nonfiction texts
Grade 9-12 · 12 problems
Language Arts, Parallel Structure and Sentence Variety
Improving balance, rhythm, and clarity in writing
Grade 9-12 · 15 problems
Language Arts, Persuasive Essays
Building clear claims, strong reasons, and effective evidence
Grade 9-12 · 15 problems
Language Arts, Research Writing and Citation
Using sources, paraphrasing, and citing evidence clearly
Grade 9-12 · 15 problems
Language Arts, Rhetorical Devices
Identifying and explaining persuasive language techniques
Grade 9-12 · 15 problems
Language Arts, SAT and ACT Vocabulary, High-Frequency Roots
Build vocabulary by analyzing common word roots, prefixes, and suffixes
Grade 9-12 · 14 problems
Language Arts, Symbolism in Literature
Identifying and interpreting symbols in texts
Grade 9-12 · 12 problems
Language Arts, Syntax Style and Diction
Analyzing sentence structure, word choice, and tone
Grade 9-12 · 15 problems
Language Arts, Technical Writing and Instructions
Writing clear steps, directions, and procedural texts
Grade 9-12 · 10 problems
Language Arts, Tone and Mood in Literature
Identifying how authors create feeling and attitude
Grade 9-12 · 12 problems
Language Arts, Writing for Different Audiences and Purposes
Adapting tone, style, evidence, and structure to fit a communication goal
Grade 9-12 · 12 problems
Literary Theory, Applying Feminist Criticism
Analyzing gender, power, voice, and representation
Grade 9-12 · 15 problems
Reading Comprehension
Analyze an informational passage for central ideas, evidence, author's purpose, and vocabulary.
Grade 9-12 · 8 problems
Shakespearean Language and Sonnets
Understanding early modern English, sonnet form, and poetic meaning
Grade 9-12 · 12 problems
Vocabulary, Roots, Prefixes, and Suffixes
Using word parts to understand complex vocabulary
Grade 9-12 · 15 problems
AP Government, Political Participation and Voting
Voter behavior, turnout, rights, and forms of civic action
Grade 9-12 · 15 problems
AP Government, The Bureaucracy and Executive Agencies
How federal agencies implement laws and shape public policy
Grade 9-12 · 15 problems
AP Microeconomics, Consumer Choice and Demand
Utility, budget constraints, and demand curves
Grade 9-12 · 15 problems
AP U.S. History, Colonial Period, 1607-1763
Colonization, regional development, imperial conflict, and early American society
Grade 9-12 · 15 problems
AP World History, Industrialization and Empire
Analyzing industrial growth, imperial expansion, and global change from 1750 to 1900
Grade 9-12 · 15 problems
Colonialism and Its Long-Term Effects
Examining power, resources, culture, and lasting global impacts
Grade 9-12 · 12 problems
Economics, Circular Flow of Income
How money, goods, services, and resources move through an economy
Grade 9-12 · 12 problems
Historical Thinking & Evidence
Apply historical thinking skills, causation, continuity, change, and source analysis.
Grade 9-12 · 8 problems
Social Studies, AP Government, Civil Liberties vs Civil Rights
Distinguishing individual freedoms from equal protection under the law
Grade 9-12 · 15 problems
Social Studies, AP Government, Congressional Structure and Powers
Bicameralism, lawmaking, oversight, and Article I powers
Grade 9-12 · 15 problems
Social Studies, AP Government, Supreme Court, Landmark Cases
Constitutional principles, holdings, and applications
Grade 9-12 · 15 problems
Social Studies, AP Human Geography, Ethnic and Cultural Diversity
Analyzing identity, culture, place, and spatial patterns
Grade 9-12 · 15 problems
Social Studies, AP Human Geography, Urban Land Use Patterns
Analyzing city structure, models, and spatial patterns
Grade 9-12 · 15 problems
Social Studies, AP Macroeconomics, Fiscal Policy and Government Spending
Analyzing taxes, spending, deficits, and aggregate demand
Grade 9-12 · 15 problems
Social Studies, AP Macroeconomics, GDP and National Income
Measuring output, income, and economic performance
Grade 9-12 · 15 problems
Social Studies, AP Macroeconomics, Monetary Policy and the Fed
Using money markets, policy tools, and macroeconomic effects
Grade 9-12 · 15 problems
Social Studies, AP Microeconomics, Market Structures and Monopoly
Analyzing firm behavior, market power, and monopoly outcomes
Grade 9-12 · 15 problems
Social Studies, AP US History, Cold War Domestic Politics
Analyzing anticommunism, rights, conformity, and federal power after World War II
Grade 9-12 · 15 problems
Social Studies, AP US History, Post-1980 America
Politics, economics, culture, and global change since 1980
Grade 9-12 · 15 problems
Social Studies, AP US History, Progressive Era and WWI
Reform, imperialism, war, and domestic change from 1890 to 1920
Grade 9-12 · 15 problems
Social Studies, AP US History, The Civil War Era 1848-1877
Sectional conflict, Civil War, emancipation, and Reconstruction
Grade 9-12 · 15 problems
Social Studies, AP World History, Classical Empires 600 BCE-600 CE
Comparing political systems, trade, belief systems, and imperial decline
Grade 9-12 · 15 problems
Social Studies, AP World History, Global Conflict and Independence Movements
Analyzing world wars, decolonization, and nationalist movements in the twentieth century
Grade 9-12 · 15 problems
Social Studies, AP World History, Post-Classical Trade Networks
Silk Roads, Indian Ocean, and Trans-Saharan connections from c. 1200 to c. 1450
Grade 9-12 · 15 problems
Social Studies, AP World History, River Valley Civilizations
Comparing early complex societies along major rivers
Grade 9-12 · 15 problems
Social Studies, Behavioral Economics and Choice Architecture
How decision design shapes individual and public choices
Grade 9-12 · 15 problems
Social Studies, Central Asia and the Steppes
Geography, history, culture, and connections across Eurasia
Grade 9-12 · 10 problems
Social Studies, Climate Change, Evidence and Policy
Examining scientific evidence, public policy, and civic decision-making
Grade 9-12 · 12 problems
Social Studies, Comparative Economic Systems
Comparing traditional, command, market, and mixed economies
Grade 9-12 · 15 problems
Social Studies, Decolonization and Independence Movements
Examining the end of colonial rule in Africa and Asia
Grade 9-12 · 12 problems
Social Studies, Federalism and States Rights
How power is shared between national and state governments
Grade 9-12 · 12 problems
Social Studies, GDP, Inflation, and Economic Cycles
Understanding economic growth, rising prices, and patterns in the economy
Grade 9-12 · 12 problems
Social Studies, GIS and Modern Mapping Tools
Using spatial data to understand people, places, and patterns
Grade 9-12 · 10 problems
Social Studies, Media Literacy and Evaluating Sources
Analyzing credibility, bias, evidence, and purpose in information sources
Grade 9-12 · 12 problems
Social Studies, Middle East, Geography, Religion, and Modern History
Exploring physical geography, major religions, and key events shaping the region
Grade 9-12 · 12 problems
Social Studies, Modern Global Issues
Exploring challenges that affect countries and people around the world
Grade 9-12 · 15 problems
Social Studies, Philosophy and Ethics, Key Thinkers
Major ideas from influential philosophers in ethics and political thought
Grade 9-12 · 12 problems
Social Studies, Population Geography and Demographics
Exploring population patterns, change, and distribution
Grade 9-12 · 12 problems
Social Studies, State Constitutions and Local Government
Exploring state powers, local responsibilities, and civic participation
Grade 9-12 · 10 problems
Social Studies, Sub-Saharan Africa, Cultures and Modern States
Exploring cultural diversity, colonial legacies, and contemporary nations
Grade 9-12 · 12 problems
Social Studies, Taxes and Government Revenue
Understanding how governments collect and use public money
Grade 9-12 · 12 problems
Social Studies, The Civil Rights Movement
Key events, leaders, laws, and goals of the movement
Grade 9-12 · 15 problems
Social Studies, The Cold War, US vs USSR
Comparing superpowers, conflicts, and global influence
Grade 9-12 · 12 problems
Social Studies, The Constitution and Bill of Rights
Exploring the structure of government and individual rights
Grade 9-12 · 15 problems
Social Studies, The Federal Court System and Due Process
Understanding federal courts, constitutional protections, and fair legal procedures
Grade 9-12 · 12 problems
Social Studies, The French Revolution
Causes, events, and effects of revolution in France
Grade 9-12 · 12 problems
Social Studies, The Gilded Age and the Rise of Industry
Industrial growth, big business, labor, and reform in the late 1800s
Grade 9-12 · 12 problems
Social Studies, The Great Depression and New Deal
Causes, effects, and government responses in the 1930s
Grade 9-12 · 12 problems
Social Studies, The Harlem Renaissance
Exploring a major cultural movement in African American history
Grade 9-12 · 12 problems
Social Studies, The Industrial Revolution
Inventions, factory work, and social change
Grade 9-12 · 12 problems
Social Studies, The Ottoman Empire, Rise and Fall
Power, expansion, reform, and decline from Anatolia to World War I
Grade 9-12 · 12 problems
Social Studies, The Partition of India and Pakistan
Causes, consequences, and human experiences of 1947
Grade 9-12 · 10 problems
Social Studies, The Progressive Era
Reform movements, government change, and social issues in the early 1900s
Grade 9-12 · 12 problems
Social Studies, The Qing Dynasty and Modern China
Imperial rule, foreign pressure, reform, revolution, and historical memory
Grade 9-12 · 12 problems
Social Studies, The Russian Revolution
Causes, key events, and consequences of revolutionary change in Russia
Grade 9-12 · 12 problems
Social Studies, The Space Race and Cold War Technology
How competition in space shaped politics, science, and daily life
Grade 9-12 · 12 problems
Social Studies, The United Nations and International Organizations
Exploring global cooperation, peace, and international decision-making
Grade 9-12 · 12 problems
Social Studies, The Vietnam War and Its Legacy
Causes, events, and long-term effects of the conflict
Grade 9-12 · 12 problems
Social Studies, US Foreign Policy and Diplomacy
Key goals, tools, and historical examples of diplomacy
Grade 9-12 · 12 problems
Social Studies, World War I Trench Warfare and New Technology
How industrial warfare changed combat on the Western Front
Grade 9-12 · 12 problems
Social Studies, World War I, Causes, Events, and Effects
Examining the origins, major developments, and consequences of World War I
Grade 9-12 · 12 problems
Social Studies, World War II and the Holocaust
Major events, causes, and human impact
Grade 9-12 · 15 problems
Social Studies, World War II, Pacific Theater and Home Front
Major events, strategies, and life during wartime
Grade 9-12 · 12 problems
The Enlightenment and Its Influence
Ideas about rights, government, reason, and reform
Grade 9-12 · 12 problems
Art & Design, Digital Design, Icons, UI, and Accessibility
Designing clear icons and inclusive user interfaces
Grade 9-12 · 15 problems
Art & Design, Photography Composition and Visual Storytelling
Using composition choices to create meaning in photographs
Grade 9-12 · 15 problems
Art History, Art as Communication, Symbols and Meaning
Interpreting visual symbols across cultures and time periods
Grade 9-12 · 15 problems
Art History, Asian Art, Chinese Painting and Japanese Woodblock Prints
Comparing materials, themes, composition, and cultural context
Grade 9-12 · 12 problems
Art History, Baroque to Rococo, Drama and Decoration
Comparing dramatic movement, emotion, ornament, and elegance in European art
Grade 9-12 · 12 problems
Art History, Renaissance Masters, Da Vinci, Michelangelo, Raphael
Comparing three defining artists of the Italian High Renaissance
Grade 9-12 · 12 problems
Astronomy, Black Holes and Neutron Stars
Exploring compact objects formed from massive stars
Grade 9-12 · 12 problems
Astronomy, Dark Matter and Dark Energy
Exploring the invisible ingredients of the universe
Grade 9-12 · 12 problems
Astronomy, Detecting Exoplanets, Transit and Radial Velocity
Using starlight to find planets around other stars
Grade 9-12 · 15 problems
Astronomy, Exoplanet Transit Light Curves
Finding planets by measuring tiny changes in starlight
Grade 9-12 · 15 problems
Astronomy, H-R Diagram and Stellar Life Cycles
Classifying stars and tracing how they change over time
Grade 9-12 · 15 problems
Astronomy, Hubble's Law and the Expanding Universe
Using galaxy velocities and distances to understand cosmic expansion
Grade 9-12 · 12 problems
Astronomy, Stellar Nucleosynthesis, Where Elements Come From
How stars build elements through fusion and explosive events
Grade 9-12 · 15 problems
Astronomy, Stellar Spectral Classification Sequence from Hottest to Coolest Practice
Practice ordering O, B, A, F, G, K, and M stars by temperature and color
Grade 9-12 · 12 problems
Astronomy, The Big Bang and Cosmology
Exploring evidence for an expanding universe
Grade 9-12 · 12 problems
Astronomy, The James Webb Space Telescope and Infrared Astronomy
Exploring the universe with infrared light
Grade 9-12 · 12 problems
Biology, Animal Behavior, Innate vs Learned
Classifying behaviors and explaining how animals acquire them
Grade 9-12 · 15 problems
Biology, AP Biology, Energy Flow and the Laws of Thermodynamics
Connecting free energy, entropy, and biological systems
Grade 9-12 · 12 problems
Biology, AP Biology, Hardy-Weinberg Equilibrium
Using allele frequencies to model population genetics
Grade 9-12 · 12 problems
Biology, AP Biology, Signal Transduction and Cell Communication
Receptors, pathways, amplification, and cellular responses
Grade 9-12 · 12 problems
Biology, ATP and Cellular Energy Currency
How cells store, transfer, and use energy
Grade 9-12 · 15 problems
Biology, Biochemistry, Carbohydrates, Proteins, Lipids, Nucleic Acids
Structure and function of the four major biological macromolecules
Grade 9-12 · 15 problems
Biology, Bioinformatics, Reading DNA Sequence Alignments
Interpreting matches, mismatches, gaps, and conserved DNA regions
Grade 9-12 · 15 problems
Biology, Biotechnology, PCR and Gel Electrophoresis
Amplifying DNA and analyzing fragment sizes
Grade 9-12 · 15 problems
Biology, Cell Membrane Structure and Selective Permeability
How membrane structure controls what enters and leaves cells
Grade 9-12 · 15 problems
Biology, Conservation Genetics, Bottlenecks and Founder Effects
How small populations lose genetic variation
Grade 9-12 · 15 problems
Biology, DNA Base Pairing Rules (Apple Tree, Car Garage) Practice
Practice matching A with T and C with G in DNA sequences
Grade 9-12 · 12 problems
Biology, Ecology, Population Growth and Carrying Capacity
Modeling how populations change over time
Grade 9-12 · 15 problems
Biology, Ecology, Symbiosis, Mutualism, Commensalism, Parasitism
Classifying ecological relationships by costs and benefits
Grade 9-12 · 15 problems
Biology, Endocrine Feedback Disruption Case Studies
Analyzing how feedback loops maintain homeostasis and what happens when they fail
Grade 9-12 · 15 problems
Biology, Enzyme Lab Data, Rate, pH, and Temperature
Analyze enzyme reaction rates using lab data
Grade 9-12 · 15 problems
Biology, Epidemiology, R0, Outbreak Graphs, and Interventions
Analyzing disease spread, outbreak graphs, and public health strategies
Grade 9-12 · 15 problems
Biology, Evolution, Evidence and Mechanisms
Analyzing evidence for common ancestry and processes that change populations
Grade 9-12 · 15 problems
Biology, Genetics, DNA Replication and Repair
How cells copy DNA accurately and fix damage
Grade 9-12 · 15 problems
Biology, Genetics, Mutations and Their Effects
How DNA changes can affect proteins, traits, and populations
Grade 9-12 · 15 problems
Biology, Genetics, Transcription and Translation
From DNA instructions to proteins
Grade 9-12 · 15 problems
Biology, Homeostasis Case Studies, Temperature, Glucose, and Water
Analyzing feedback loops that keep internal conditions stable
Grade 9-12 · 15 problems
Biology, Human Microbiome and Health
Exploring how microbial communities affect the body
Grade 9-12 · 15 problems
Biology, Microbiology, Bacteria, Viruses, and Antibiotics
Comparing microbes and explaining how antibiotics work
Grade 9-12 · 12 problems
Biology, Neurobiology, Reflexes, Reaction Time, and Nerve Signals
Exploring how the nervous system detects, processes, and responds to stimuli
Grade 9-12 · 15 problems
Biology, Nine Essential Amino Acids Practice
Identify, classify, and apply the role of essential amino acids in human nutrition
Grade 9-12 · 12 problems
Biology, Phases of Mitosis in Order (IPMAT) Practice
Practice sequencing interphase, prophase, metaphase, anaphase, and telophase
Grade 9-12 · 12 problems
Biology, Plant Hormones and Tropisms
How chemical signals guide plant growth and responses
Grade 9-12 · 15 problems
Biology, The Endocrine System, Hormones and Feedback Loops
How hormones regulate body systems and maintain homeostasis
Grade 9-12 · 12 problems
Biology, The Excretory System, Kidneys, Filtration, and Homeostasis
How kidneys filter blood and help maintain internal balance
Grade 9-12 · 12 problems
Biology, Twelve Cranial Nerves in Order Practice
Memorizing cranial nerve names, numbers, and basic functions
Grade 9-12 · 12 problems
Calculus, Derivatives
Finding and interpreting rates of change
Grade 9-12 · 15 problems
Calculus, Integrals
Finding antiderivatives, definite integrals, and area under curves
Grade 9-12 · 15 problems
Cell Biology
Compare prokaryotic and eukaryotic cells, identify organelles, and explain cell processes.
Grade 9-12 · 8 problems
Chemical Bonding, Ionic and Covalent
Comparing how atoms bond and form compounds
Grade 9-12 · 12 problems
Chemistry, Acid-Base Chemistry, Buffers and Titration Curves
Using buffer equations and interpreting acid-base titration graphs
Grade 9-12 · 15 problems
Chemistry, AP Chemistry, Spectroscopy and Beer-Lambert Law
Using absorbance, concentration, path length, and spectra
Grade 9-12 · 12 problems
Chemistry, Cation Carries a Positive Charge Practice
Identifying cations, charge, and electron loss
Grade 9-12 · 12 problems
Chemistry, Chemical Equilibrium and Le Chatelier's Principle
Predicting shifts in reversible reactions
Grade 9-12 · 15 problems
Chemistry, Covalent Bonding and Molecular Geometry (VSEPR)
Predicting molecular shapes from Lewis structures and electron domains
Grade 9-12 · 15 problems
Chemistry, Electrochemistry, Galvanic and Electrolytic Cells
Comparing spontaneous and nonspontaneous redox reactions in cells
Grade 9-12 · 12 problems
Chemistry, Electron Transfer in Redox Reactions (LEO Says GER) Practice
Identify oxidation, reduction, electron flow, and redox agents
Grade 9-12 · 12 problems
Chemistry, Equilibrium Constants from Concentration Tables
Using equilibrium and ICE tables to calculate Kc
Grade 9-12 · 15 problems
Chemistry, Green Chemistry, Atom Economy and Safer Solvents
Evaluating chemical reactions for waste reduction and solvent safety
Grade 9-12 · 15 problems
Chemistry, Intermolecular Forces and Physical Properties
Connecting particle attractions to boiling point, solubility, vapor pressure, and more
Grade 9-12 · 15 problems
Chemistry, Ionic Bonding and Lattice Structures
Electron transfer, crystal lattices, and properties of ionic compounds
Grade 9-12 · 15 problems
Chemistry, Kinetics, Reaction Rates and Activation Energy
Calculating reaction rates and explaining energy barriers
Grade 9-12 · 12 problems
Chemistry, Materials Chemistry, Ceramics, Alloys, and Composites
Comparing structure, properties, and uses of engineered materials
Grade 9-12 · 15 problems
Chemistry, Nuclear Chemistry, Fission, Fusion, and Decay
Balancing nuclear reactions and understanding radioactive processes
Grade 9-12 · 12 problems
Chemistry, Organic Chemistry, Nomenclature and Isomers
Practice naming organic compounds and identifying isomers
Grade 9-12 · 15 problems
Chemistry, Organic Chemistry, Polymerization Reactions
How monomers join to form addition and condensation polymers
Grade 9-12 · 12 problems
Chemistry, Periodic Trends, Atomic Radius, Ionization Energy
Using the periodic table to predict atomic size and energy needed to remove electrons
Grade 9-12 · 15 problems
Chemistry, Phase Diagrams and Heating Curves
Interpreting phase changes, temperature plateaus, and pressure-temperature graphs
Grade 9-12 · 15 problems
Chemistry, Polar Solvents Dissolve Polar Solutes and Nonpolar Solvents Dissolve Nonpolar Solutes Practice
Using molecular polarity to predict solubility
Grade 9-12 · 12 problems
Chemistry, Polymers, Plastics, and Materials Science
Exploring polymer structure, properties, and uses
Grade 9-12 · 12 problems
Chemistry, Quantum Mechanical Model of the Atom
Orbitals, quantum numbers, and electron configurations
Grade 9-12 · 15 problems
Chemistry, Reaction Mechanisms and Activation Energy
Connecting reaction pathways, rate-determining steps, and energy changes
Grade 9-12 · 15 problems
Chemistry, Seven Diatomic Elements Practice
Identifying and writing formulas for the seven elements that exist as diatomic molecules
Grade 9-12 · 12 problems
Chemistry, Solubility Rules and Precipitation Reactions
Predicting precipitates and writing ionic equations
Grade 9-12 · 15 problems
Chemistry, Solution Chemistry, Molarity and Dilution
Calculating concentration, moles, volume, and dilution
Grade 9-12 · 15 problems
Chemistry, Thermochemical Equations and Calorimeter Data
Using heat, temperature change, and balanced equations
Grade 9-12 · 15 problems
Chemistry, Thermochemistry, Enthalpy and Hess's Law
Calculating heat, enthalpy changes, and reaction pathways
Grade 9-12 · 12 problems
Chemistry, Titration Data and Endpoint Analysis
Using titration data to find concentration, equivalence point, and endpoint accuracy
Grade 9-12 · 15 problems
Chemistry, What Oxidation and Reduction Mean in Redox Reactions (OIL RIG) Practice
Identify electron loss, electron gain, oxidizing agents, and reducing agents
Grade 9-12 · 12 problems
Chemistry, Which Electrode Undergoes Which Reaction (AN OX, RED CAT) Practice
Use AN OX and RED CAT to identify oxidation, reduction, anodes, and cathodes
Grade 9-12 · 12 problems
Computer Science, AI Bias and Fairness Case Studies
Analyzing real-world impacts of bias, fairness, and accountability in AI systems
Grade 9-12 · 15 problems
Computer Science, APIs and JSON Data Exchange
Understanding requests, responses, endpoints, and structured data
Grade 9-12 · 15 problems
Computer Science, Binary and Data Representation
Representing numbers, text, images, and sound with bits
Grade 9-12 · 15 problems
Computer Science, Computational Biology, DNA Strings and Pattern Matching
Using algorithms to search, compare, and analyze DNA sequences
Grade 9-12 · 15 problems
Computer Science, Cybersecurity Incident Response Plan
Planning, documenting, and improving a response to cyber incidents
Grade 9-12 · 15 problems
Computer Science, Evaluating LLM Answers, Accuracy, Bias, and Citation Checks
Practice checking AI responses for reliability, fairness, and evidence
Grade 9-12 · 15 problems
Computer Science, Internet and Networks
How data moves, devices connect, and networks communicate
Grade 9-12 · 15 problems
Computer Science, Logic Gates
Building and analyzing Boolean logic circuits
Grade 9-12 · 15 problems
Computer Science, Password Hashing and Authentication Basics
Protecting passwords with hashing, salting, and secure login design
Grade 9-12 · 15 problems
Computer Science, Place Values in a Binary Nibble from Left to Right Practice
Identify the 8s, 4s, 2s, and 1s places in 4-bit binary numbers
Grade 9-12 · 12 problems
Computer Science, Spreadsheet Formulas to Model Real Problems
Using cell references, functions, and formulas to solve realistic problems
Grade 9-12 · 15 problems
Computer Science, Web Accessibility Testing Checklist
Testing websites for inclusive design and WCAG basics
Grade 9-12 · 15 problems
CS, Arrays and Lists
Storing, accessing, and updating ordered data
Grade 9-12 · 12 problems
CS, Big-O Notation and Algorithm Efficiency
Comparing how algorithms grow as input size increases
Grade 9-12 · 12 problems
CS, Computer Networks, TCP, UDP, and the OSI Model
Comparing transport protocols and understanding layered network design
Grade 9-12 · 12 problems
CS, Cryptography, Ciphers and Encryption
Practice with classic ciphers, keys, encryption, and security ideas
Grade 9-12 · 12 problems
CS, Databases and SQL Basics
Understanding tables, queries, keys, and simple SQL commands
Grade 9-12 · 12 problems
CS, Dynamic Programming, Memoization and Tabulation
Solving overlapping subproblems with saved results
Grade 9-12 · 12 problems
CS, Functions and Parameters
Writing reusable code with inputs and return values
Grade 9-12 · 12 problems
CS, Graph Algorithms, BFS and DFS
Exploring breadth-first search and depth-first search on graphs
Grade 9-12 · 12 problems
CS, Java, Classes, Methods, and Public Static Void Main
Understanding Java program structure, methods, and the main method
Grade 9-12 · 12 problems
CS, Loops and Control Flow
Tracing, writing, and reasoning about loops and decisions
Grade 9-12 · 15 problems
CS, Machine Learning and Artificial Intelligence Basics
Understanding data, models, training, and responsible AI
Grade 9-12 · 12 problems
CS, Merge Sort and Quick Sort Algorithms
Comparing divide-and-conquer sorting strategies
Grade 9-12 · 12 problems
CS, Neural Networks, From Perceptron to Deep Learning
How artificial neurons learn patterns from data
Grade 9-12 · 12 problems
CS, Recursion and Base Cases
Tracing recursive calls and identifying stopping conditions
Grade 9-12 · 12 problems
CS, Regular Expressions, Patterns and Matching
Finding text patterns with regex syntax
Grade 9-12 · 12 problems
CS, Sorting Algorithms, Bubble, Selection, and Insertion
Tracing, comparing, and choosing basic sorting algorithms
Grade 9-12 · 12 problems
CS: SQL: SELECT, WHERE, JOIN
Querying tables, filtering rows, and combining data
Grade 9-12 · 12 problems
Data Structures, Stacks, Queues, and Trees
Practice core operations and use cases for common data structures
Grade 9-12 · 12 problems
Drama, Shakespeare on Stage, Iambic Pentameter and Soliloquy
Performing Shakespeare through rhythm, voice, and inner thought
Grade 9-12 · 10 problems
Drama, Tech Theater, Lights, Sound, and Stage Design
Planning technical choices that support a stage production
Grade 9-12 · 10 problems
Earth Science, Desertification and Land Degradation
Causes, impacts, and solutions for dryland ecosystems
Grade 9-12 · 12 problems
Earth Science, Earthquake Risk Maps and Building Choices
Using seismic hazard information to make safer construction decisions
Grade 9-12 · 15 problems
Earth Science, Glaciers, Ice Sheets, and Sea Level
How land ice, ocean water, and climate interact
Grade 9-12 · 12 problems
Earth Science, Mohs Hardness Scale from 1 to 10 Practice
Using scratch tests to compare mineral hardness
Grade 9-12 · 12 problems
Earth Science, Plate Boundaries, Convergent, Divergent, Transform
Identifying plate interactions and the landforms they create
Grade 9-12 · 12 problems
Earth Science, The Coriolis Effect and Global Wind Patterns
How Earth's rotation shapes winds and circulation cells
Grade 9-12 · 12 problems
Earths Atmosphere and Climate Change
Atmospheric layers, greenhouse gases, and human impacts on climate
Grade 9-12 · 15 problems
Electric Fields and Electric Potential
Describing forces, field strength, and electric potential
Grade 9-12 · 12 problems
Engineering, Civil and Structural
Forces, materials, design constraints, and safety in the built environment
Grade 9-12 · 15 problems
Engineering, Design Failure Analysis, Why Structures Break
Investigating loads, stresses, materials, and failure modes
Grade 9-12 · 15 problems
Engineering, Earthquake Design, Base Isolation vs Bracing
Comparing two ways to reduce earthquake damage
Grade 9-12 · 15 problems
Engineering, Engineering Design Process
Defining problems, creating solutions, testing prototypes, and improving designs
Grade 9-12 · 15 problems
Engineering, Environmental Engineering, Stormwater Runoff Solutions
Designing systems that reduce flooding, erosion, and water pollution
Grade 9-12 · 15 problems
Engineering, Manufacturing Tolerances and Quality Control
Using specifications, measurements, and inspection data to judge product quality
Grade 9-12 · 15 problems
Environmental Science, Biodiversity
Exploring species, genetic, and ecosystem diversity
Grade 9-12 · 15 problems
Environmental Science, Climate Change
Causes, evidence, impacts, and solutions
Grade 9-12 · 15 problems
Environmental Science, Climate Models and Prediction
Using evidence, scenarios, and uncertainty to understand future climate
Grade 9-12 · 15 problems
Environmental Science, Environmental Justice and Equity
Analyzing fairness in environmental risks, benefits, and decision-making
Grade 9-12 · 10 problems
Environmental Science, Environmental Policy and the EPA
How laws, regulations, and the EPA protect people and the environment
Grade 9-12 · 12 problems
Environmental Science, Geoengineering Risks and Proposals
Evaluating climate intervention ideas, benefits, uncertainties, and ethics
Grade 9-12 · 10 problems
Environmental Science, Ocean Acidification and Coral Reefs
How changing ocean chemistry affects reef ecosystems
Grade 9-12 · 12 problems
Environmental Science, Renewable Energy
Comparing clean energy sources, impacts, and tradeoffs
Grade 9-12 · 15 problems
Environmental Science, Sustainability and Ecological Footprint
Analyzing resource use, waste, and sustainable choices
Grade 9-12 · 12 problems
Environmental Science, The Nitrogen and Phosphorus Cycles
How essential nutrients move through ecosystems
Grade 9-12 · 12 problems
Environmental Science, Urban Heat Islands and City Planning
How city design affects temperature, energy use, and public health
Grade 9-12 · 12 problems
Evolution, Phylogenetic Trees and Cladistics
Reading evolutionary relationships using shared derived traits
Grade 9-12 · 15 problems
Financial Literacy, Budgeting and Saving
Build a budget, track spending, and plan savings goals
Grade 9-12 · 15 problems
Financial Literacy, College Costs and Financial Aid
Understanding tuition, aid, loans, and true college costs
Grade 9-12 · 12 problems
Financial Literacy, Comparing Checking Accounts and Fees
Practice choosing checking accounts by comparing costs, requirements, and features
Grade 9-12 · 15 problems
Financial Literacy, Credit Scores and Borrowing Responsibly
Understanding credit scores, credit reports, and smart borrowing choices
Grade 9-12 · 15 problems
Financial Literacy, Cryptocurrency Basics and Volatility
Understanding digital assets, risk, and price changes
Grade 9-12 · 12 problems
Financial Literacy, Insurance, Protecting Against Risk
Understanding premiums, deductibles, coverage, and risk management
Grade 9-12 · 15 problems
Financial Literacy, Investing Basics, Risk, Return, and Diversification
Understanding how investment choices balance potential growth and uncertainty
Grade 9-12 · 15 problems
Financial Literacy, Investing, Stocks, Bonds, and Mutual Funds
Comparing investment types, risk, return, and diversification
Grade 9-12 · 15 problems
Financial Literacy, Reading a Pay Stub, Gross, Net, and Deductions
Understanding earnings, taxes, deductions, and take-home pay
Grade 9-12 · 12 problems
Financial Literacy, Renting an Apartment, Deposits, Utilities, and Budgets
Practice calculating move-in costs, monthly expenses, and affordable rent
Grade 9-12 · 16 problems
Financial Literacy, Renting vs Buying a Home
Comparing costs, benefits, risks, and long-term financial impact
Grade 9-12 · 12 problems
Financial Literacy, Retirement Accounts, 401(k) and IRA Basics
Understanding workplace plans, IRAs, taxes, matching, and long-term growth
Grade 9-12 · 12 problems
Financial Literacy, Student Loans and Repayment
Understanding borrowing costs, repayment plans, and smart loan decisions
Grade 9-12 · 12 problems
Financial Literacy, Taxes, How They Work and Where They Go
Understanding tax types, calculations, and public services
Grade 9-12 · 15 problems
Foreign Languages, Latin Roots
Building vocabulary through Latin word parts
Grade 9-12 · 15 problems
Geometry, Circles
Angles, arcs, chords, tangents, and circle equations
Grade 9-12 · 15 problems
Geometry, Coordinate Geometry
Using coordinates to analyze distance, slope, midpoint, and equations of lines
Grade 9-12 · 15 problems
Geometry, Three Trig Ratios (SOH CAH TOA) Practice
Practice using sine, cosine, and tangent in right triangles
Grade 9-12 · 12 problems
Geometry, Transformations (High School)
Translations, reflections, rotations, dilations, and compositions on the coordinate plane
Grade 9-12 · 15 problems
Geometry, Triangles (High School)
Classifying triangles, proving congruence, and solving for missing measures
Grade 9-12 · 15 problems
Health, Drug and Alcohol Effects on the Body
How substances affect body systems, behavior, and safety
Grade 9-12 · 12 problems
Health, Genetics and Inherited Conditions
Understanding inheritance, risk, and healthy decision-making
Grade 9-12 · 12 problems
Health, Mental Health, Stress, Anxiety, and Coping
Recognizing stress responses and practicing healthy coping skills
Grade 9-12 · 12 problems
Health, Order of CPR Steps (C-A-B) Practice
Practicing the correct sequence for compression, airway, and breathing steps
Grade 9-12 · 12 problems
Health, The Reproductive System and Human Development
Understanding body systems, puberty, pregnancy, and prenatal growth
Grade 9-12 · 12 problems
Kinematics, Velocity, Acceleration, and Motion Graphs
Interpreting motion with equations, graphs, and units
Grade 9-12 · 12 problems
Mitosis and Meiosis, Cell Division
Comparing how cells grow, repair, and form gametes
Grade 9-12 · 12 problems
Music, Music History, Classical, Jazz, and Rock
Tracing major styles, composers, performers, and cultural influences
Grade 9-12 · 15 problems
Music, Music Theory, Intervals and Chord Inversions
Identifying intervals, triads, seventh chords, and inversions
Grade 9-12 · 12 problems
Music, Music Theory, Major and Minor Scales
Identifying, building, and comparing major and minor scales
Grade 9-12 · 12 problems
Object-Oriented Programming, Classes and Objects
Practice identifying classes, objects, attributes, and methods
Grade 9-12 · 12 problems
Philosophy, Branches of Philosophy
Ethics, logic, metaphysics, and epistemology
Grade 9-12 · 12 problems
Philosophy, Eastern Philosophy, Confucius, Buddhism, and Daoism
Comparing major ideas from Confucianism, Buddhism, and Daoism
Grade 9-12 · 12 problems
Philosophy, Ethics Thought Experiments and Reasoning
Analyze moral dilemmas using clear claims, reasons, and principles
Grade 9-12 · 15 problems
Philosophy, Ethics, Utilitarianism vs Deontology
Comparing consequences, duties, and moral decision making
Grade 9-12 · 12 problems
Philosophy, Existentialism, Kierkegaard, Nietzsche, Sartre
Exploring choice, meaning, faith, freedom, and responsibility
Grade 9-12 · 12 problems
Philosophy, Logic and Critical Thinking
Evaluating arguments, evidence, and fallacies
Grade 9-12 · 15 problems
Philosophy, Logic, Fallacies, and Everyday Arguments
Evaluating reasons, evidence, and common mistakes in reasoning
Grade 9-12 · 15 problems
Philosophy, Philosophy of Science, What Makes Knowledge Reliable
Evaluating evidence, methods, and trust in scientific knowledge
Grade 9-12 · 12 problems
Physical Education, Injury Prevention and Stretching
Safe movement habits for active bodies
Grade 9-12 · 10 problems
Physical Education, Nutrition for Athletes, Fueling Performance
Choosing foods and fluids that support training, recovery, and health
Grade 9-12 · 12 problems
Physical Education, Sports Science, How the Body Performs
Exploring energy systems, movement, fitness, and performance
Grade 9-12 · 15 problems
Physical Education, Training Plans and Progressive Overload
Designing safe workouts that improve over time
Grade 9-12 · 15 problems
Physics, AP Physics 1, Rotational Kinematics and Dynamics
Angular motion, torque, rotational inertia, and equilibrium
Grade 9-12 · 12 problems
Physics, AP Physics 2, Thermodynamics and Heat Engines
Work, heat, internal energy, entropy, and engine efficiency
Grade 9-12 · 12 problems
Physics, AP Physics C Mechanics, Center of Mass and Moment of Inertia
Calculating centers of mass and rotational inertia for systems and continuous bodies
Grade 9-12 · 12 problems
Physics, Capacitors, Inductors, and RLC Circuits
Energy storage, time constants, reactance, resonance, and AC circuit behavior
Grade 9-12 · 12 problems
Physics, Circular Motion and Centripetal Acceleration
Calculating speed, period, force, and inward acceleration
Grade 9-12 · 15 problems
Physics, DC Circuits, Ohm's Law and Kirchhoff's Rules
Analyze current, voltage, resistance, and conservation laws in DC circuits
Grade 9-12 · 15 problems
Physics, Electric Forces and Coulomb's Law
Calculating electric forces between charged particles
Grade 9-12 · 15 problems
Physics, Electromagnetic Induction and Faraday's Law
Calculating induced emf and predicting induced current direction
Grade 9-12 · 15 problems
Physics, Electromagnetic Spectrum from Longest to Shortest Wavelength Practice
Ordering electromagnetic waves by wavelength and connecting wavelength to frequency and energy
Grade 9-12 · 12 problems
Physics, Gravitational Fields and Orbital Mechanics
Calculating gravitational force, field strength, orbital speed, and period
Grade 9-12 · 12 problems
Physics, Kinematics, Velocity-Time and Position-Time Graphs
Interpreting slope, area, displacement, and acceleration
Grade 9-12 · 15 problems
Physics, Magnetic Forces on Moving Charges
Calculating force magnitude, direction, and charged particle motion in magnetic fields
Grade 9-12 · 15 problems
Physics, Measurement Uncertainty in Motion Labs
Estimating, calculating, and reporting uncertainty in motion measurements
Grade 9-12 · 15 problems
Physics, Medical Imaging, X-Rays, Ultrasound, and MRI
Comparing how electromagnetic waves, sound waves, and magnetic fields create medical images
Grade 9-12 · 15 problems
Physics, Momentum, Impulse, and Conservation
Calculating momentum, impulse, and collision outcomes
Grade 9-12 · 15 problems
Physics, Newton's Laws, Free Body Diagrams and Net Force
Drawing forces and calculating the motion they cause
Grade 9-12 · 15 problems
Physics, Newton's Third Law
Action and reaction forces in everyday situations
Grade 9-12 · 15 problems
Physics, Optics, Lenses, Mirrors, and Ray Diagrams
Using ray diagrams and equations to predict image properties
Grade 9-12 · 15 problems
Physics, Photoelectric Effect and Wave-Particle Duality
Connecting photons, electrons, and matter waves
Grade 9-12 · 12 problems
Physics, Relative Motion and Reference Frames
Describing motion from different points of view
Grade 9-12 · 12 problems
Physics, Resistor Color Codes 0 Through 9 Practice
Practice matching resistor color bands to digit values
Grade 9-12 · 12 problems
Physics, Rotational Motion and Torque
Angular motion, torque, rotational inertia, and equilibrium
Grade 9-12 · 12 problems
Physics, Simple Harmonic Motion and Pendulums
Analyzing springs, pendulums, period, frequency, and energy
Grade 9-12 · 12 problems
Physics, Solar Panels, Energy, Power, and Angle Data
Calculating solar energy, power output, efficiency, and angle effects
Grade 9-12 · 15 problems
Physics, Special Relativity, Time Dilation and Length Contraction
Using the Lorentz factor to compare measurements in different frames
Grade 9-12 · 12 problems
Physics, Standard Model of Particle Physics
Classifying particles and interactions
Grade 9-12 · 12 problems
Physics, Standing Waves and Resonance
Nodes, antinodes, harmonics, and resonant frequencies
Grade 9-12 · 15 problems
Physics, Torque, Equilibrium, and Bridge Loads
Analyzing forces, moments, and support reactions in bridge structures
Grade 9-12 · 15 problems
Physics, Two-Dimensional Projectile Motion
Resolving vectors and predicting projectile paths
Grade 9-12 · 15 problems
Physics, Which Hand Rule Applies to Motors and Generators Practice
Choosing the correct rule for motor effect and generator effect problems
Grade 9-12 · 12 problems
Physics, Work, Energy, and the Work-Energy Theorem
Calculating work, kinetic energy, potential energy, and net work
Grade 9-12 · 15 problems
Psychology, AP Psychology, States of Consciousness and Sleep Stages
Identifying sleep stages, biological rhythms, and altered states
Grade 9-12 · 12 problems
Psychology, AP Psychology, Statistics and Research in Psychology
Designing studies, interpreting data, and evaluating evidence
Grade 9-12 · 12 problems
Psychology, Biological Bases of Behavior, Brain and Neurons
Exploring how the nervous system supports thought, emotion, and behavior
Grade 9-12 · 15 problems
Psychology, Cognition, Problem Solving and Decision Making
How people use strategies, shortcuts, and evidence to choose and solve
Grade 9-12 · 15 problems
Psychology, Developmental Psychology, Stages of Life
How people grow and change from prenatal development through late adulthood
Grade 9-12 · 15 problems
Psychology, Introduction, History and Major Perspectives
Tracing psychology from early ideas to modern approaches
Grade 9-12 · 15 problems
Psychology, Learning, Classical and Operant Conditioning
Comparing how people and animals learn through associations and consequences
Grade 9-12 · 15 problems
Psychology, Memory Bias and Eyewitness Testimony
How memory errors can affect what witnesses report
Grade 9-12 · 15 problems
Psychology, Memory, Encoding, Storage, and Retrieval
How information enters, stays in, and comes out of memory
Grade 9-12 · 15 problems
Psychology, Motivation and Emotion
Exploring why people act and how feelings influence behavior
Grade 9-12 · 15 problems
Psychology, Personality Theories, Freud, Jung, Rogers
Comparing psychodynamic, analytic, and humanistic views of personality
Grade 9-12 · 15 problems
Psychology, Psychological Disorders and the DSM
Classifying disorders while thinking critically and ethically
Grade 9-12 · 15 problems
Psychology, Research Methods, Experimental Design and Ethics
Designing fair studies and protecting participants
Grade 9-12 · 15 problems
Psychology, Sensation and Perception
How the brain detects, organizes, and interprets sensory information
Grade 9-12 · 15 problems
Psychology, Social Influence, Conformity, Obedience, and Groupthink
Understanding how people are influenced by groups and authority
Grade 9-12 · 15 problems
Psychology, Social Psychology, Conformity, Obedience, Bias
How groups, authority, and thinking patterns influence behavior
Grade 9-12 · 15 problems
Psychology, Stress, Coping, and the Nervous System
How the body responds to stress and how coping strategies help
Grade 9-12 · 15 problems
Psychology, Treatments, Therapy, Medication, and CBT
Comparing common mental health treatments and how they work
Grade 9-12 · 15 problems
Science, Atomic Structure and Electron Configuration
Understanding atoms, subatomic particles, and how electrons are arranged
Grade 9-12 · 12 problems
Science, Balancing Chemical Equations
Using coefficients to conserve atoms in reactions
Grade 9-12 · 15 problems
Science, Circular Motion and Centripetal Force
Understanding inward force, speed, radius, and acceleration in circular paths
Grade 9-12 · 12 problems
Science, Conservation of Energy
How energy changes form while the total amount stays constant
Grade 9-12 · 15 problems
Science, DNA Structure and Protein Synthesis
Exploring how genetic information is stored and used to build proteins
Grade 9-12 · 15 problems
Science, Ecological Succession
How ecosystems change over time
Grade 9-12 · 12 problems
Science, Ecology and Biodiversity
Exploring ecosystems, species interactions, and the value of biodiversity
Grade 9-12 · 15 problems
Science, Energy Thermodynamics and Heat Transfer
Thermal energy, the laws of thermodynamics, and mechanisms of heat transfer
Grade 9-12 · 15 problems
Science, Enzymes and Metabolic Pathways
How enzymes speed reactions and organize metabolism
Grade 9-12 · 12 problems
Science, Fluid Mechanics, Pressure and Buoyancy
Exploring pressure in fluids and the forces that make objects float or sink
Grade 9-12 · 12 problems
Science, Free Body Diagrams
Identifying forces acting on objects
Grade 9-12 · 15 problems
Science, Gas Laws, Boyles, Charles, and Ideal Gas
Relating pressure, volume, temperature, and moles in gases
Grade 9-12 · 12 problems
Science, Laws of Thermodynamics
Understanding energy, entropy, and thermal systems
Grade 9-12 · 12 problems
Science, Lenses and Mirrors
Exploring reflection, refraction, and image formation
Grade 9-12 · 15 problems
Science, Magnetic Fields and Electromagnetic Induction
Exploring how magnets, currents, and changing fields interact
Grade 9-12 · 12 problems
Science, Momentum and Collisions
Using mass, velocity, and conservation of momentum
Grade 9-12 · 15 problems
Science, Naming Chemical Compounds
Practice naming ionic and covalent compounds
Grade 9-12 · 12 problems
Science, Newtons Laws of Motion
Understanding inertia, force, mass, and action-reaction pairs
Grade 9-12 · 15 problems
Science, Nuclear Physics and Radioactivity
Atomic nuclei, decay, half-life, and radiation safety
Grade 9-12 · 12 problems
Science, Ohm's Law and Electric Circuits
Using voltage, current, and resistance in simple circuits
Grade 9-12 · 15 problems
Science, Optics, Reflection, Refraction, and Lenses
How light reflects, bends, and forms images through lenses
Grade 9-12 · 12 problems
Science, Organic Chemistry, Functional Groups and Reactions
Identifying common functional groups and predicting basic organic reactions
Grade 9-12 · 12 problems
Science, Osmosis, Diffusion, and Active Transport
Comparing passive and active movement across cell membranes
Grade 9-12 · 12 problems
Science, Periodic Table Trends
Exploring patterns in atomic size, ionization energy, and electronegativity
Grade 9-12 · 15 problems
Science, pH Scale and Acids and Bases
Using the pH scale to classify acids, bases, and neutral substances
Grade 9-12 · 15 problems
Science, Photosynthesis, Light Reactions and Calvin Cycle
Tracing energy and matter through the two main stages of photosynthesis
Grade 9-12 · 12 problems
Science, Plate Tectonics
Earth's moving plates and their effects
Grade 9-12 · 15 problems
Science, Population Ecology and Growth Models
Exploring how populations change over time
Grade 9-12 · 12 problems
Science, Projectile Motion
Analyzing motion in two dimensions under gravity
Grade 9-12 · 15 problems
Science, Redox Reactions and Electrochemistry
Oxidation, reduction, and electron flow in chemical systems
Grade 9-12 · 12 problems
Science, Series and Parallel Circuits
Comparing current, voltage, and resistance in circuit types
Grade 9-12 · 15 problems
Science, Solution Chemistry, Molarity and Concentration
Calculating molarity, dilution, and concentration relationships
Grade 9-12 · 12 problems
Science, Stoichiometry Calculations
Using balanced equations to calculate amounts of reactants and products
Grade 9-12 · 15 problems
Science, The Cell Cycle and Cancer
How normal cell division is controlled and how cancer can develop
Grade 9-12 · 12 problems
Science, The Endocrine System and Hormones
Understanding glands, hormones, and body regulation
Grade 9-12 · 12 problems
Science, The Mole and Avogadros Number
Using the mole to count particles in chemistry
Grade 9-12 · 12 problems
Science, Waves and Sound
Exploring wave behavior, sound properties, and real-world applications
Grade 9-12 · 15 problems
Science, Work, Energy, and Power
Calculating force, motion, energy changes, and power
Grade 9-12 · 12 problems
SEL, Coping with Loss, Grief, and Change
Building healthy strategies for difficult transitions
Grade 9-12 · 10 problems
SEL, Goal Setting and Long-Term Planning
Building realistic goals, action steps, and reflection habits
Grade 9-12 · 10 problems
SEL, Healthy Relationships and Boundaries
Recognizing respect, communication, consent, and personal limits
Grade 9-12 · 10 problems
SEL, Identity and Self-Awareness
Exploring values, strengths, roles, and personal growth
Grade 9-12 · 15 problems
SEL, Leadership and Community Engagement
Practicing ethical leadership, service, and collaboration
Grade 9-12 · 15 problems
SEL, Self-Regulation Strategies for High School
Practicing tools for managing emotions, stress, and choices
Grade 9-12 · 10 problems
Statistics, ANOVA, Comparing Multiple Groups
Using one-way ANOVA to compare three or more means
Grade 9-12 · 15 problems
Statistics, Bayes' Theorem and Conditional Probability
Using conditional probability, tables, trees, and Bayes' theorem
Grade 9-12 · 15 problems
Statistics, Chi-Square Tests
Goodness of fit, independence, and homogeneity
Grade 9-12 · 12 problems
Statistics, Confidence Intervals and Margin of Error
Estimating population values with samples
Grade 9-12 · 12 problems
Statistics, Descriptive Statistics (High School)
Summarizing data with center, spread, and shape
Grade 9-12 · 15 problems
Statistics, Experimental Design, Control Groups and Confounds
Identifying control groups, treatments, and hidden variables
Grade 9-12 · 15 problems
Statistics, Hypothesis Testing, Null and Alternate
Writing null and alternate hypotheses for claims
Grade 9-12 · 12 problems
Statistics, Linear Regression and Line of Best Fit
Modeling relationships with scatterplots, slope, residuals, and predictions
Grade 9-12 · 12 problems
Statistics, Logistic Regression and Categorical Outcomes
Modeling probabilities for yes-or-no outcomes
Grade 9-12 · 12 problems
Statistics, Multiple Regression and Interaction Terms
Interpreting models with more than one predictor
Grade 9-12 · 12 problems
Statistics, Non-Parametric Tests, When Assumptions Fail
Choosing and using rank-based tests when standard assumptions are not met
Grade 9-12 · 15 problems
Statistics, Probability Distributions
Modeling outcomes with discrete and continuous distributions
Grade 9-12 · 15 problems
Statistics, Probability Rules, Addition and Multiplication
Using addition, multiplication, and conditional probability rules
Grade 9-12 · 12 problems
Statistics, Regression Diagnostics, Residuals and Conditions
Using residuals to check whether a linear regression model is appropriate
Grade 9-12 · 15 problems
Statistics, Sampling
Designing and evaluating samples for statistical studies
Grade 9-12 · 15 problems
Statistics, Scatter Plots and Correlation
Interpreting patterns, direction, strength, and linear association
Grade 9-12 · 12 problems
Statistics, The Binomial Distribution
Modeling repeated trials with two possible outcomes
Grade 9-12 · 12 problems
Statistics, The Normal Distribution and Z-Scores
Using z-scores to compare values and estimate normal probabilities
Grade 9-12 · 12 problems
Statistics, Time Series Analysis, Trends, Seasonality, and Cycles
Identifying patterns in data collected over time
Grade 9-12 · 12 problems
Statistics, Two-Way Tables and Conditional Probability
Using counts to find conditional probabilities
Grade 9-12 · 12 problems
World Languages, French Imparfait vs Passé Composé
Choosing the right past tense in French
Grade 9-12 · 15 problems
World Languages, French, Passé Composé and Past-Tense Verbs
Forming and using the passé composé with avoir and être
Grade 9-12 · 12 problems
World Languages, Latin, Noun Declensions and Cases
Identifying noun forms, cases, numbers, and declensions
Grade 9-12 · 12 problems
World Languages, Spanish, Ser vs Estar
Choosing the correct verb for identity, traits, location, condition, and events
Grade 9-12 · 12 problems
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