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Every course, as questions

Not a syllabus — the questions students actually get stuck on, in the order that teaches them. Click any one and Jentoo draws the answer.

74 courses · 10,809 topics · 52,254 questions

Test Prep

Every section of every admissions test, topic by topic — enough to sit the real thing.

SAT®Every domain of the digital SAT — the algebra and the data, and the grammar rules animated as structures you can actually see.15 units · 1,600 questions PSAT/NMSQT®The SAT's content at PSAT scope, plus the one thing the SAT has no version of: the Selection Index and the road to National Merit.17 units · 1,351 questions ACT®All four ACT sections at the enhanced test's pace — including Science, which is really a reading test performed on graphs.49 units · 3,130 questions SHSATThe NYC specialized-schools test: revising and editing drawn as sentence surgery, and every math topic the grid-ins can reach.15 units · 1,330 questions ISEE® Lower LevelThe ISEE for students entering grades 5 and 6 — all five sections, drawn at the level where the pictures matter most.5 units · 516 questions ISEE® Middle LevelThe ISEE for students entering grades 7 and 8, quantitative comparisons included, one topic at a time.5 units · 674 questions ISEE® Upper LevelThe ISEE for students entering grades 9 through 12 — algebra, coordinate geometry, and the verbal sections made visual.9 units · 749 questions SSAT® ElementaryThe SSAT for grades 3 and 4, taught in pictures — the quantitative, verbal and reading sections a young student actually meets.5 units · 395 questions SSAT® Middle LevelThe SSAT for grades 5 through 7 — two quantitative sections, synonyms and analogies, reading, and the writing sample.11 units · 620 questions SSAT® Upper LevelThe SSAT for grades 8 through 11 — analogies as visible relationships, and every math topic the two quantitative sections test.13 units · 636 questions GRE® General TestThe shortened GRE, end to end — verbal reasoning, the full ETS quantitative content list, and the Analyze an Issue essay.11 units · 973 questions MCAT®Every numbered AAMC content category across all four MCAT sections, plus the reasoning skills the passages are really testing.38 units · 3,931 questions LSAT®The LSAT as it is now: arguments taken apart block by block, conditional logic drawn as arrows, and reading comprehension.17 units · 957 questions

Advanced Placement

The full College Board framework for every AP course, unit by unit.

AP® BiologyThe 2025 framework unit by unit — with mitosis and meiosis run side by side so the chromosome count is finally visible.9 units · 734 questions AP® ChemistryNine units and the 16 required labs, with orbitals, titration curves and particulate views drawn instead of described.10 units · 793 questions AP® Physics 1The re-scoped 2024 framework with fluids in — and motion graphs that draw themselves as the object moves alongside them.8 units · 681 questions AP® Physics 2Units 9 to 15: field lines redrawing as a charge is dragged, ray diagrams flipping, fringes building one photon at a time.8 units · 658 questions AP® Physics C: MechanicsSeven calculus-based units — moments of inertia by integration, drag as a differential equation, precession drawn in vectors.7 units · 566 questions AP® Physics C: E&MCalculus-based E&M, units 8 to 13 — Gauss's law where the symmetry does the work, and flux through a loop that is moving.6 units · 489 questions AP® Environmental ScienceNine units from nutrient cycles to climate feedbacks, with the rule of 70, half-life and dose-response all worked on screen.9 units · 596 questions AP® Calculus ABThe secant line sliding into the tangent, Riemann rectangles converging, and the Fundamental Theorem shown rather than stated.8 units · 564 questions AP® Calculus BCEverything in AB, plus the whole of series — every convergence test, and Taylor polynomials hugging a curve until they stop.10 units · 650 questions AP® StatisticsThe revised 5-unit College Board framework, taught as animations: distributions built, intervals swarming, p-values shading in.5 units · 611 questions AP® PrecalculusAll four units, including the one the exam skips — the unit circle unrolling into a sine wave, and matrices moving the plane.4 units · 544 questions AP® MicroeconomicsEvery graph in AP Micro, actually moving: curves shifting, surplus filling in, deadweight loss opening as the tax wedge goes in.6 units · 574 questions AP® MacroeconomicsEvery model that moves, actually moving: AD/AS self-correcting, a deposit expanding through the banks, the Phillips curve collapsing.6 units · 472 questions AP® US Government & PoliticsThe whole College Board framework drawn out: veto points, district maps, court paths, and money flows you can actually watch move.5 units · 551 questions AP® Comparative GovernmentSix countries' institutions side by side — and the same votes run through three electoral systems to three different legislatures.5 units · 517 questions AP® PsychologyThe redesigned five-unit College Board framework, taught as animations: neurons firing, curves acquiring, brains lighting up.6 units · 806 questions AP® Computer Science AThe whole redesigned four-unit Java framework, animated: memory, references, loops, grids, sorts and the call stack.4 units · 515 questions AP® Computer Science PrinciplesAll five College Board big ideas drawn out: bits counting up, packets rerouting, algorithms racing, and keys locking and unlocking.5 units · 487 questions AP® US HistoryAll nine College Board periods drawn as moving maps, causal chains and data that builds itself, instead of paragraphs.9 units · 713 questions AP® World History: ModernAll nine College Board units, c. 1200 to now, as animated maps, trade flows and cause-and-effect chains instead of paragraphs.9 units · 620 questions AP® European HistoryAll nine College Board units from 1450 to now, as maps that redraw themselves, empires that grow and collapse, and data that moves.9 units · 585 questions AP® Human GeographyAll seven College Board units drawn out: models that move, projections that morph, diffusion on a map, districts redrawn on a grid.7 units · 539 questions AP® Music TheoryAll eight College Board units drawn on a staff: scales built, chords stacked, voices moving, and cadences resolving in front of you.8 units · 471 questions AP® Art HistoryAll ten College Board content areas, taught as composition overlays, structural diagrams and process animations rather than photographs.10 units · 633 questions AP® English Language & CompositionRhetoric made structural — arguments built as buildings, fallacies animated, and every skill in the AP Language framework.20 units · 951 questions AP® English Literature & CompositionPoetry with its meter drawn, prose with its narrator's camera moved, and every skill in the AP Literature framework.18 units · 1,000 questions

College

First- and second-year university courses, taught the way the lectures run.

Calculus IPrecalculus review through the Fundamental Theorem of Calculus, with limits proved rigorously and every rule derived, not just stated.9 units · 602 questions Calculus IIIntegration techniques, applications, differential equations, parametric and polar curves, and series — the second course in calculus.19 units · 563 questions Calculus III (Multivariable)Calculus set loose in three dimensions: surfaces sliced into curves, gradients climbing hills, and volumes swept two different ways.5 units · 593 questions Linear AlgebraStrang's course, animated: matrices that move space, eigenvectors that hold their line, and least squares as a shadow on a wall.12 units · 562 questions Differential EquationsBoyce and DiPrima's course, animated: slope fields, phase lines, resonance, Laplace transforms, and the systems that unify it all.13 units · 536 questions Cell BiologyThe molecular machines inside every cell, in motion: pumps, motors, ribosomes, and the signals that make them move.19 units · 646 questions GeneticsFrom Mendel's peas to genome-wide selection: how traits are inherited, mapped, mutated, expressed, and evolve across populations.14 units · 504 questions Organic ChemistryTwo semesters of Clayden/Klein-level organic chemistry, animated: electrons moving, chairs flipping, stereocenters inverting.25 units · 730 questions General ChemistryBoth semesters of general chemistry, from atoms and measurement through equilibrium, thermodynamics, and nuclear and coordination chemistry.21 units · 912 questions Physics I: MechanicsCalculus-based mechanics through waves and heat, with collisions replayed in the centre-of-mass frame where they make sense.21 units · 553 questions Physics II: E&M and WavesCharge, field, and circuit meet light and the atom: the calculus-based second semester, from Coulomb's law to nuclear decay.16 units · 678 questions Principles of MicroeconomicsEvery graph a principles course runs: curves shifting, an indifference map tangent to a budget line, a payoff matrix resolving to Nash.11 units · 478 questions Principles of MacroeconomicsGDP, inflation, and unemployment measured, and the models that move: AD-AS, the money multiplier, loanable funds, and Solow growth.15 units · 487 questions Introduction to PsychologyThe OpenStax survey course, from the scientific method and the neuron through disorders and therapy, taught as animations.16 units · 721 questions Introduction to Computer ScienceThe CS1/CS2 sequence made visible: the call stack, pointer surgery on a linked list, sorts racing, and a DP table filling in.21 units · 596 questions

Harvard

Six Harvard College courses, following their published syllabi.

Ec 10a: Principles of EconomicsHarvard's Ec 10a, the microeconomics half of Mankiw's course: markets, welfare, taxation, trade, and the policy debates built on it.22 units · 493 questions Math 21a: Multivariable CalculusHarvard's fast-moving multivariable calculus course, built toward one destination: the fundamental theorem of calculus in higher dimensions.10 units · 468 questions CS50: Introduction to Computer ScienceHarvard's legendary intro to CS: Scratch to C to Python, SQL, and the web, taught as things you can actually watch happen.12 units · 443 questions LS 1a: Life SciencesChemistry, molecular biology, and cell biology taught as one integrated story, the way Harvard's LS 1a teaches it.12 units · 470 questions PSY 1: Introduction to PsychologyPsychology as a research science, taught by the faculty who study it: methods, statistics, judgment and decision, the mind's design.25 units · 533 questions Stat 110: ProbabilityHarvard's legendary Stat 110: story proofs, trees of natural frequencies, and simulations instead of formulas alone.12 units · 492 questions

High School

The core high-school sequence, before and beside AP.

Algebra IWhere most people decide they are bad at math. Balance scales, factoring as rectangle area, and parabolas you can watch move.17 units · 430 questions Algebra IIThe full Algebra II sequence, from complex numbers and polynomial graphs to logarithms, trig, conics, and matrices.15 units · 523 questions GeometryThe Common Core high-school Geometry sequence, transformations, congruence, similarity, circles, and solids, as animations you watch happen.13 units · 467 questions Precalculus & TrigonometryFunctions, full trig identities, laws of sines and cosines, vectors, polar and parametric curves, conics, and a first look at limits.15 units · 645 questions BiologyCell to ecosystem, plus the body systems AP Biology leaves out — with natural selection run as a population shifting over generations.21 units · 608 questions ChemistryThe core high-school chemistry course, from atoms and bonding through the mole, gases, solutions, and acids and bases, as animations.12 units · 535 questions PhysicsA full year of physics, motion to modern, taught by watching the ball fall, the current flow, and the image flip in a lens.14 units · 473 questions Earth ScienceEarth's layers, plate tectonics, weather, oceans, and the sky above it all, taught as the NGSS Earth and Space Science framework, animated.16 units · 452 questions US HistoryThe American story from before Columbus to today, drawn as the maps, migrations, and turning points that actually explain it.22 units · 484 questions World HistoryFrom the first river-valley cities to globalization, told as maps that move, trade networks that flow, and empires that rise and fall.14 units · 539 questions EconomicsMicro, macro, and personal finance in one course: supply and demand, GDP, the Fed, credit scores, and compound interest, animated.11 units · 396 questions

Elementary & Middle

Where the pictures matter most — the foundations, drawn out.

Basic MathFrom place value to percentages and geometry, drawn out so a fraction is a pizza being cut and a percent is 100 shaded squares.16 units · 555 questions Pre-AlgebraThe bridge from arithmetic to algebra: a balance scale that stays level, and the inequality sign flipping for a visible reason.15 units · 388 questions Intro to ScienceWhy the sky is blue, why ice floats, and how a seed becomes a tree — the NGSS grades 3-8 framework, animated end to end.14 units · 517 questions

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