Every lesson maps to a recurring skill — not a textbook chapter. We worry about what shows up, so you don't have to.
Algebra, geometry, data — the patterns that show up on every exam, drilled until they're reflexes.
Start a sample lessonClaims, evidence, and authorial moves. Read like a strategist, not a tourist.
Start a sample lessonGrammar without mystery, style without fluff, arguments that earn the reader's trust.
Start a sample lessonThree loops, working together: diagnose, practice, review. Every wrong answer becomes a follow-up. Every right answer raises your mastery score.
A short calibration finds the topics where you're losing points fastest.
Each set targets your weakest skill at the right difficulty — no busywork.
Wrong answers come back later, with explanations, until they stick.
Free covers the core lessons in every subject. Pro unlocks the full library, advanced tier questions, and full review history.
What Pro unlocks