Quant Interview Drills by Topic
Focused quant interview drills by topic: probability, expected value, counting, market making, mental math, statistics, coding, and communication.
Candidates turning a diagnostic result into targeted quant interview practice.
Probability drills
Use coins for independence and stopping rules, dice for finite counting, cards for combinations without replacement, and Bayes prompts for base rates. Rotate the surface topic only after the method is clear.
Expected value and betting drills
Practice linearity, payoff tables, fair prices, and stopping choices. Turn each expected value into a decision: would you take the bet, at what price, and how would size change if the game repeated?
Market making and estimation drills
Quote markets on uncertain values, then review fair value, width, inventory, and update quality. For estimation, give ranges and track calibration. The drill is decision quality, not just final profit or one exact number.
Mental math and statistics drills
Drill percentages, fractions, squares, variance intuition, covariance, regression interpretation, and sampling error. Keep math tied to interview use: updating a probability, valuing a game, or explaining uncertainty in data.
Coding and communication drills
For coding, solve small problems with examples and edge cases. For communication, redo solved math prompts aloud. The best drill forces the skill that actually failed in your diagnostic.
Common mistakes
Candidates often choose drills by what looks impressive. Choose drills by the latest miss log. If the same error repeats, keep the drill narrow until it stops repeating in mixed practice.
Practice the pattern
Use the LeetQuidity curriculum and calibration to turn this topic into a focused practice plan.