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An interactive math book

Think your way to the AMC 10/12 and AIME.

Drag points, run counting machines, factor polynomials and rotate complex numbers. Predict first, then check. Every problem comes with hints, a full solution and a video.

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Your progress
Start with Chapter 1 →0 problems solved · 0 sections mastered

Pick a unit

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Combinatorics

Count, compute odds and expect the unexpected, without listing every case.

11 chapters · 11 ready →

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Algebra

Factor, substitute and let Vieta do the heavy lifting.

9 chapters · 9 ready →

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Number Theory

Primes, remainders and bases: the hidden structure of the integers.

8 chapters · 8 ready →

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Geometry

From angle chasing to 3-D solids and coordinates, figures you can move.

10 chapters · 10 ready →

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Advanced Topics

Logs, trig, inequalities and complex numbers for AMC 12 and AIME.

6 chapters · 6 ready →

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Contest Strategies

Score more points with the time you have.

1 chapter · 1 ready →

Review

Problems you missed come back here, spaced out so they stick.

Contest simulator

Eliminate answer choices, plan your 75 minutes, catch silly mistakes.

Formula sheet

Every theorem card in one printable page.

Progress

Mastery map, weak spots, profiles and backups.