Best quant interview prep resources and question banks: six options compared
Price, format, depth and best fit
| Option / source | Price | Format | Depth / scope | Best for | Limits |
|---|---|---|---|---|---|
| Green Book — Xinfeng Zhou | Book price varies by edition and seller | A Practical Guide to Quantitative Finance Interviews | Book-length worked technical problems | Offline, deliberate problem solving | No interactive progress tracking or current employer-process guarantee |
| Heard on the Street — Timothy Falcon Crack | Book price varies by edition and seller | Quantitative Questions from Wall Street Job Interviews | Book-length quantitative interview preparation | A second author’s selection of worked problems | Check the edition; a book is not a current recruiting specification |
| QuantGuide | Free Basic; US$35/month or US$240/year Premium | Question bank, hints, solutions and company tags | Focused quantitative interview practice | Filtering and repeated online drills | Detailed solutions and premium questions have access limits |
| NeetQuant | Free account | Questions, worked solutions and simulators | Topic practice and timed assessment exercises | Budget-conscious online practice | Employer names do not imply endorsement or identical tests |
| QuantVault | Free subset; confirm paid access terms | Problems, courses, firm guides and games | Statistics, regression, stochastic calculus and related topics | Candidates wanting broader technical topic coverage | Provider counts and interview claims are not independently audited |
| SelfMadeQuant | Free guides; free account for hints and worked bank answers where available | Topic guides, public questions and lesson links | Nine bank topics, with finance and coding support | Following a weak answer back to its underlying lesson | No employer affiliation or verified question-frequency ranking |
Start with one book or bank and an error log
A useful quant interview resource helps you explain a solution and adapt it when the assumptions change. It should not merely provide answers to memorise. For offline study, the Green Book and Heard on the Street offer book-length collections. For searchable drills, compare QuantGuide, NeetQuant, QuantVault and SelfMadeQuant against the particular topics you need.
The two book links identify editions, rather than a guaranteed current price. Buy or borrow a legitimate copy and check its contents before choosing. We have not audited every paid question in every bank, and we do not infer employer endorsement from logos or company tags. This is a comparison by use case, not a league table of hiring outcomes.
Books versus online drills
A book makes it easy to slow down, write a complete derivation and review a coherent selection of problems. The cost is usually a one-time purchase, while updates require a new edition. Online banks can make filtering and repeat practice easier. Check whether hints, full explanations and useful difficulty filters are included in the tier you intend to use.
The Green Book is Xinfeng Zhou's A Practical Guide to Quantitative Finance Interviews. Heard on the Street is Timothy Falcon Crack's quantitative interview collection. Their titles and editions should be recorded in your study notes so that a reference points to the correct problem and solution. Neither title alone tells you what a current vacancy will assess.
Match the bank to the missing technique
QuantGuide offers a free Basic tier and paid access to premium material, hints, detailed solutions and company filtering. NeetQuant advertises free questions, worked solutions and simulators with an account. QuantVault presents a mix of problem practice and technical courses, with a free subset. Confirm the current access rules directly; a headline question count does not establish the quality or independence of the explanations.
SelfMadeQuant's public guides include original questions with answers and explanations; the larger bank links questions back to lessons. It is useful when the obstacle is understanding why a method works. It is less directly comparable to a timed company-assessment replica. We do not claim that bank counts predict employer demand, nor that completing the bank predicts interview success.
A repeatable preparation loop
Attempt a question without the answer, stating the random experiment and the information available. If you need help, reveal one hint and write down what it changed. After solving, explain the boundary cases: does the probability lie between zero and one, is the expectation finite, and are the units right?
Record the cause of an error rather than just the question title. Useful labels include a wrong sampling model, omitted costs, a conditioning error, unjustified independence and a coding edge case. Revisit a nearby problem after several days. Being able to reproduce yesterday's answer is weaker evidence than solving a new version.
Prepare for the role as well as the puzzle
Researchers may need to defend an experiment and its validation; developers may need to reason about data structures and system behaviour; traders may need to make and explain decisions under uncertainty. Those are preparation priorities, not universal employer checklists. Use official role descriptions and recruiter instructions to select the balance.
Our firm preparation guides link primary employer material and explain which practice is editorial. For technical repairs, start with probability, statistics or programming. Free material is enough to test a study routine before adding another subscription.