Mental Math vs lemma

Sharpen mental math for consulting, IB, and quant interviews. Practice fast, realistic drills with estimation‑friendly scoring, track progress with streaks and XP, and build confidence under pressure. Highlights: - Adaptive drills, case math chains, and estimation sandbox - Lightning rounds, interview mode, and exam‑style sessions - Career‑specific prep for Consulting, IB, and Quant The career-specific content requires a subscription to access, one subscription allows for the use of ANY feature of the app. Privacy Policy: https://marble-liquid-091.notion.site/Heat-Studio-LLC-Privacy-Policy-28652966b06a807282efed41b058f5dd Terms of Service: https://marble-liquid-091.notion.site/Heat-Studio-LLC-Terms-of-Service-28652966b06a80028c0deeca197b4912?source=copy_link

Train like a quant. Daily. Lemma is the focused, no-fluff prep app for quantitative interviews — built for students and grads targeting Jane Street, Citadel, Optiver, Two Sigma, and the rest of the trading-firm gauntlet. WHAT'S INSIDE WITH YOUR SUBSCRIPTION • Daily sprints — bite-sized timed sets of mental math, probability, combinatorics, expected value, and market-making problems • Per-category ELO — your skill is tracked across 10 disciplines, from Novice to Expert • Adaptive difficulty — problems chosen to keep you at the edge of your level, not above or below • Hints + step-through solutions — get unstuck without giving up • Streaks, XP, leagues — habit loops without the noise • Achievements — unlock as you grind • Leaderboard — see how you stack up WHO IT'S FOR • CS / math undergrads applying to trading firms • Recent grads prepping for technical interviews • Self-learners who want a daily quantitative-thinking habit • Anyone curious about how trading interviews actually feel WHY LEMMA We strip out the gamified clutter and keep what matters: hard problems, fast iteration, real numbers on your progress. The interface borrows more from a Bloomberg terminal than a typical mobile game — monospaced metrics, hairline borders, dark by default. Most prep books drown you in 800 pages. Most courses lock you in for months. Lemma is 10 minutes a day, sharpened every day. — Lemma offers an optional auto-renewable subscription for unlimited daily sprints and premium problem sets. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://rogeru13.github.io/lemma-legal/privacy-policy/