The best prep depends on what is missing. Someone who cannot yet find the expected value of a die roll gains nothing from a timed mental-maths drill, and someone fluent in probability gains little from another textbook. So the first step is not choosing a site. It is a ten-minute self-test that tells you which of four stages you are in.
A quant interview is a job interview for work in quantitative finance, where people use maths, statistics and code to price things, manage risk and trade. This page helps you choose interview prep by the stage you are at. It does not rank prep sites. It tells you what each stage needs, gives a short self-test for each stage, and then sets out what six prep sites say about themselves on their own pages.
How this page was written: every fact about another site comes from that site's own pages, read on 8 November 2026, and is linked. Prices are left out, because they change and differ by country; each site's own price page is linked instead. Thuztra Learn is our product. It is described separately, and it is not placed among the others. Nothing here promises an interview result or a job.
Stage 1: foundations
What it is: probability, expectation, conditional probability and basic statistics, learned properly. In our view, most interview problems are probability problems in disguise.
Self-test:
- A fair coin is tossed until the first head. What is the expected number of tosses? Answer: 2.
- Two cards are drawn from a shuffled deck without replacement. What is the chance both are aces? Answer: .
- and are independent, each with variance 1. What is the variance of ? Answer: 2.
If you miss two or more: this is your stage. Prep that trains it is a probability textbook with exercises. Our interview books page lists two, and the quantitative finance syllabus gives a fuller self-test.
Stage 2: problem speed
What it is: solving short probability puzzles, brainteasers and estimates quickly and correctly, under mild time pressure.
Self-test: give yourself five minutes for each.
- What is the expected number of rolls of a fair die until a six? Answer: 6.
- Two fair dice are rolled. What is the expected value of the larger of the two numbers? Answer: , about 4.47.
- Without a calculator: about what is , to one decimal place? Answer: about 7.1.
If you solve fewer than two in time: this is your stage. Prep that trains it is a large bank of short problems with worked answers, plus mental-arithmetic drill.
Stage 3: the interview itself
What it is: saying your reasoning out loud, recovering from a wrong start, asking for what you need, and handling questions about markets and about yourself.
Self-test: record yourself solving a Stage 2 problem out loud, without notes. Play it back. Could someone follow each step? Did you state your assumptions?
If not: this is your stage. Prep that trains it is practice with another person, mock interviews, and timed sets in the format of the role you want. Some roles also test trading games or market-making exercises, where you quote a price at which you would buy and sell.
Stage 4: depth for the role
What it is: the subject behind the role. Researchers get statistics and stochastic calculus; traders get options and market intuition; developers get code, often C++ and data structures; risk quants get risk measures. Our roadmap by role sets out each branch, and our stochastic calculus interview guide covers one of the deepest topics.
Self-test: pick three topics from your target role's section of the roadmap and explain each to a friend in two minutes. Any topic you cannot explain is your gap.
If you have gaps: prep that trains this stage is a structured course or textbook in the subject, not more puzzles.
What six prep sites say about themselves
The list below names sites that sell quant interview prep, in alphabetical order. It is not a ranking. Every entry is the site's own description, from its own pages, read on 8 November 2026. The last line of each entry is our reading of which stage the site's own description matches, so you can check it against the self-tests above. Counts are the sites' own, and they change.
- What it says it is: A quantitative finance jobs site, with interview practice
- What it says it has: A bank of 190 interview questions and an interview study guide by topic
- Free part it describes: The study guide showed its content without a sign-in when we read it
- Stage its description matches, in our reading: 2, with a study guide for 1
- What it says it is: An "Interview Prep Platform for Quants"
- What it says it has: Interview questions, each "paired with a comprehensive solution" and a hint, and a speed-arithmetic game
- Free part it describes: Not stated on the home page
- Stage its description matches, in our reading: 2
- What it says it is: "Learn quantitative finance by building it": lessons in maths, technology and finance, with interview prep
- What it says it has: A syllabus page of lessons across three streams
- Free part it describes: The syllabus page is "free to browse"
- Stage its description matches, in our reading: 1 and 4
- What it says it is: Quant interview prep with problems, courses and trading games
- What it says it has: "3,200+ problems" and "40+ interactive courses"
- Free part it describes: "~400 curated problems, the skill assessment, the trading-game tutorials, and the Intro course" (home page)
- Stage its description matches, in our reading: 1 to 3
- What it says it is: "Optimally prepare for your trading and quant interviews through our vast collection of resources"
- What it says it has: "Hundreds of real interview questions", market-making games, online assessments and coding problems
- Free part it describes: "Solve a free problem" links to one coding problem
- Stage its description matches, in our reading: 2 and 3
- What it says it is: A "trading interview preparation platform"
- What it says it has: "1071 Interview Questions", "13 Tailored Preparation Courses" and "11 interactive Market Making Games", plus paid mock interviews
- Free part it describes: Free example questions, and practice tests and games with "no signup required"
- Stage its description matches, in our reading: 2 and 3
Two more names are on our list of providers we may describe, CQF and QuantInsti. They sell longer courses rather than interview prep, so they are on our quantitative finance courses compared page instead.
For current prices, use each site's own page: OpenQuant (no price page found), QuantGuide, Quantt, QuantVault, Tradermath (plans are on the home page) and Trading Interview.
Some of these sites make claims about jobs, offers or pay on their pages. We do not repeat them, and no prep site can promise a job.
Where Thuztra Learn fits your prep
Thuztra Learn is our product, so it is not in the list above and we do not rank it. Here is what it has, so you can match it to your stage yourself:
- Stage 1: a Core quant curriculum that starts from school maths and probability, with check questions on many lessons.
- Stage 2: banks of interview questions, quant puzzles and brainteasers, with statements and worked answers written by us, though some set-ups are classic problems.
- Stage 3: Learn has no live mock interviews with a person. Use a friend, or a site above that offers them, for this stage.
- Stage 4: role tracks for the researcher, trader, developer and risk quant. It does not teach low-latency trading systems or data-structure interview drills.
Some pages are free, including two worked interview questions: quoting into a lopsided book and twenty vol, and what it says about tomorrow. The rest is a paid subscription: see what Thuztra Learn is and what it costs.
Five checks before you pay for any prep
- Does it train your stage? Use the self-tests above.
- Who wrote the content? Look for a named author or team on the site's own pages.
- Can you see a sample first? A free sample shows the level and the quality of the answers.
- Does it explain, or only answer? A bare answer trains recall. A worked answer trains method.
- What does it claim? Be careful with any promise of a job, an offer or a salary. No prep can promise those.
Fine print: the sites above are named only to describe what they offer, in their own words. They have no link to Thuztra. If anything here about a site is wrong, write to team@thuztra.com and we will take the line down first and then check it. Education only, not advice.
In short
Find your stage with the self-tests below, then pick prep that trains that stage. Foundations need a textbook, problem speed needs many short problems, the interview itself needs practice out loud, and role depth needs the subject behind the role. Check every site's own pages before you pay.
Terms used here
Related
The best books for quantitative finance interviews
Nine books for quant interviews, grouped by the stage they help with, plus what the Green Book and Heard on the Street each are, from the author and catalogue records. No book problems copied.
The quant roadmap by role, in quantitative finance
What to learn, in order, for a quant trader, researcher, developer or analyst. One shared start, four branches, and a plain list of which steps Thuztra Learn teaches and which it does not.
Stochastic calculus interview questions, and the toolkit that answers them
The five kinds of stochastic calculus question in quantitative finance interviews, the six tools that answer them, four worked examples, and the slips that cost the most marks.
The quantitative finance syllabus, layer by layer
The full quantitative finance syllabus in seven layers, from school maths to stochastic calculus, risk and code, with prerequisites and a self-test for every layer.
The four quant jobs
Researcher, trader, developer and risk, described by what each actually does all day. One rule followed through all four desks, and the places where the four of them disagree.
More on these topics
- Quantitative finance courses compared, and how to choose one
- Getting into quant from any college
- How to become a quant in India, in quantitative finance
- How to become a quant in the UK and Europe, in quantitative finance
- Quant vs data scientist, in quantitative finance
- Quant vs software engineer, and the quant developer in between
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