R3CK0N

Quant Prep: free quant interview practice

Quant Prep is free practice for quantitative trading and research interviews, in your browser with no signup: a timed trading sprint, interview questions with worked solutions, a mock phone interview, a market-making game and timed drills.

Every question is original, written in the style of the firms' screening tests rather than taken from any real one. Everything on this page is free to use, and a study plan ties the parts together so you know what to do next.

How it works

  • Plan: a six-week study plan for trader, researcher or developer roles, whose weekly targets tick off from your real results.
  • Trading sprint: multiple-choice arithmetic against a hard clock. Classic is 80 questions in 8 minutes; Short is 40 in 4; Decimals & fractions is 40 in 5 with the mix tilted that way. Whole numbers, decimals, fractions, percentages, missing operands and two-step problems; +1 for a right answer, −1 for a wrong one, 0 for a skip. Keys 1 to 5 answer and S skips, so your hands never leave the keyboard.
  • Interview questions: probability, expected value, combinatorics, statistics, brainteasers, options and markets, linear algebra, calculus and programming, each with a worked solution. A missed question can become a spaced-repetition flashcard.
  • Mock interview: four or six questions shaped for the role, one at a time. Think aloud against the clock as you would on a phone screen, then check your answer and how you explained it.
  • Market making: quote a bid and an ask on a hidden value from dice, cards or coins. A counterparty trades against mispriced quotes and tells you why it hit you.
  • Drills: Sequences (type the next term), Estimation (within ×2 on Easy, ×1.5 on Medium, ×1.25 on Hard), an Interview mix of both, and the four operations as a weighted blend, all timed in Math mode.
  • Stats: accuracy and pace by topic and question type, so the weak spots are named.

A worked example

Question 23 of a Classic sprint: what is 15% of 240? Ten percent is 24, five percent is 12, so 36. Press the key for 36 and question 24 is up. The eight minutes end on question 64: 52 right, 8 wrong, 4 skipped, 16 never reached. The score is 52 − 8 = 44, and the results screen breaks it down by question type, so you can see that the wrong answers were mostly fractions and go to the Decimals & fractions preset next.

In the Estimation drill, "seconds in 3 years" wants about 94.6 million; typing 1e8 is within six percent, which counts at every level.

Frequently asked questions

Is Quant Prep free, and do I need an account?

It is free, with no ads and no paywall, and you can use every part of it without signing up. Your attempts and stats are saved in your browser.

Is the trading sprint the real 80 in 8 test?

No. It has the same shape, 80 questions in 8 minutes with a penalty for wrong answers, but the questions are generated here and taken from no real test. The 80 in 8 guide explains how the real screens differ.

What should I practise first?

Open the Plan tab and pick your role; the first week is an arithmetic baseline, because every later step is faster with it. If you have an interview inside two weeks, run one Classic sprint a day and read the solutions to the interview questions you miss.

What do quant interviews actually ask?

Fast arithmetic under time pressure, probability and expected value, brainteasers, and for trading roles a market-making or betting game where you quote prices on something uncertain. Each of those has its own tab here.

Guides

Play

JavaScript is needed to play.