← Quant course

Learnr · Quant practice

The trading playground

Build intuition one decision at a time. Learn the rules, play a short session, then review the maths behind every move.

18 games0 saved sessionsFictional credits · no real money

Interview preparation

Use the same foundations across firms. These are Learnr study paths, not replicas of official assessments.

Flow Traders

Mental arithmetic, sequences, ETF mechanics and explaining your motivation.

  1. Start with arithmetic lessons and Pattern Detective.
  2. Practise Basket Arbitrage and the card/dice games.
  3. Explain NAV, creation/redemption and the effects of transaction costs.
  4. Run the 60-question, 6-minute Flow-style mock, then review mistakes.
Official preparation / recruiting guide ↗

Optiver

Quantitative reasoning, probability, trading decisions and communication.

  1. Build reliable numerical fluency.
  2. Use Chance Lab, Next Card and Odds & Bankroll.
  3. Play Card Exchange and manage risk in live markets.
  4. Explain every decision aloud, including changes of mind.
Official preparation / recruiting guide ↗

Jane Street

Collaborative reasoning, expected value, conditional probability and market making.

  1. Read the official Probability & Markets guide.
  2. Solve introductory probability problems without memorising answers.
  3. Trade card information and work through adverse-selection lessons.
  4. Watch the official mock interview and practise explaining assumptions.
Official preparation / recruiting guide ↗

Citadel / Citadel Securities

Choose the role first: research, trading and software interviews differ.

  1. Build probability/statistics and coding foundations.
  2. Explain a research or engineering project and its limitations.
  3. Practise analysing data, algorithms and trade-offs.
  4. Use the firm’s role-specific interview guide.
Official preparation / recruiting guide ↗
Flow-style maths · 60 questions · 6 minutesReference catalogue · 926 titles ↗Full maths mock · 80 questions · 8 minutes · +1/−1Speed sprint · 120 secondsInterview question bank

Your recent sessions

Finish a game to save your result here. Game history is stored on this browser; it is separate from course XP and account sync.

Keep learning

Open quant lessons, speed sprints, puzzles and mock assessments. For interview context, read Jane Street’s Probability & Markets guide and Flow Traders’ preparation FAQ.

Original Learnr exercises. These are educational models, not official hiring tests or investment advice.