Lemma — train for the maths olympiad

Olympiad mathematics training built like a game. Eight levels take you from school arithmetic to IMO-level problem solving, one technique at a time.

What's inside

• 75 lessons across algebra, combinatorics, geometry and number theory
• 450 curated problems with hints and full solutions
• 65 real olympiad problems — including IMO 1959/1, IMO 1964/2 and IMO 1988/6 — with progressive hints, complete walkthroughs and marking rubrics
• Unlimited generated practice at six difficulty levels, so you never repeat a problem
• 26 problem-solving techniques: pigeonhole, invariants, AM–GM, Cauchy–Schwarz, Vieta jumping, power of a point, inversion and more

Who it's for

Students preparing for AMC 8, AMC 10/12, AIME, EGMO, national olympiads and the IMO — and anyone who wants to get genuinely better at solving hard problems.

Pricing

Free to start, forever. Paid plans from €5.04 per month — a fraction of the cost of olympiad tutoring or coaching courses.

Create a free account and take the placement quiz.