Purpose-built for trading and quant interviews, our platform prepares you for every stage of the interview process with guides, assessments, and simulations specifically tailored to the firms you're applying to.
Numerical Skills
Speed arithmetic and number-sequence drills that mirror the numerical tests at leading trading firms, built for accuracy under time pressure.
Online Assessments
Prepare for trading firm online assessments that focus on probability, reasoning and mathematics.
Interview Question Database
Practice trading interview questions with our curated database of brainteasers sourced from real trading interviews.
Market Making Games
Develop your trading intuition, quick thinking, and decision-making skills with our Market Making Games.
Interview Preparation Guides
Firm-specific strategies, walkthroughs, and insights for every stage of the trading and quant interview process.
Coding Practice
Interview coding problems for quant developer roles: solve them in a real editor, run real tests, and read the editorial.
Cognitive Games
Sharpen your focus, reaction speed, and multitasking with interactive games designed to simulate cognitive tests from real trading assessments.
Trading Jobs
Discover new internships, job opportunities and recruitment events in the trading industry easily.
02 / Beat the competition
Market Making Games
Tradermath offers several versions of the classic Market Making game used by top trading firms. Sharpen your trading instincts, quick decision-making, and mental math in realistic simulations. Test your skills, push your limits, and train like a pro.
Train like a trader
Develop your trading intuition fast and push yourself harder as difficulty levels progress.
Make better decisions
Improve your quick thinking and decision-making under pressure.
Balance risk and reward
Sharpen your risk assessment and numerical skills under time pressure.
The go-to platform for aspiring traders and quants worldwide.
Join a community of thousands of top-performing applicants from elite institutions who trust Tradermath to get ready for interviews at the world's most competitive trading and quant firms.
03 / Expand your knowledge
Knowledge Base
Access comprehensive interview preparation guides covering everything from firm-specific strategies to technical concepts and trading fundamentals.
Deep-dive into detailed articles written by industry experts to help you understand what to expect and how to excel in your interviews.
Tradermath offers a fully curated and continuously updated database of hundreds of real interview questions from top trading firms, covering everything from analytical puzzles to technical problems and brainteasers.
Practice the questions that matter most, build confidence quickly, and minimise surprises on interview day.
Well done, solved!Top-of-Book Ticker · 3/3 tests passed+1 on the track
Top-of-Book Ticker
Order Books · Medium · 25 min
Open in editor
You are building the ticker component of a market data feed: after every order book event, it must publish the current top of book (best bid and best ask).
A cancel may reference an id that was never added or was already cancelled. Treat that as a no-op.
All tests passed3/3 · 41 ms
best bid tracks new orders4 ms
cancel of an unknown id is a no-op3 ms
100,000 events inside the time limit34 ms
EditorialTop-of-Book Ticker
Repeated extremes under insert and delete: a heap per side. heapq has no delete-by-key, so a cancel only leaves the live set and stale entries are popped lazily when they reach the top.
O(n log n) timeO(n) spaceLazy deletion
Solved · next on the trackNext problemPrice-Time Priority Book→
“Amazing company: both the services they offer, as well as their customer service. I had a subscription and it’s well worth the money, tried a few other providers but honestly nothing comes close.
Also, I had some issues with my billing, and they stepped right in to solve them & address any questions I had. Huge thanks to James for all his help :)
Would 100% recommend 🙏🏻”
“Your website had helped me too much to keep up the momentum leading to rank up in global quant competitions and in many quant interviews ….thanks again for such a great resource…would coin that website as a asset for Quants”
“One stop solution for your upcoming trading interview! Specifically the Red Test of flow traders was on point, cannot comment on others as I am yet to sit for them. Highly recommended.”
“Very nice website, have used the tests for Flow Traders and definitely recommend this. In my opinion, there are no other companies that offer such tests so accurately for practice.”
“I have been an Data Enthusiast from a very long time now. Trading firms relies lot on data and strategies. I believe Tradermath is the right place to start your trader/quant learning journey.”
“tradermath offers the best quality prep for a number of firms - these are probably the only mental math rounds which closely resemble the actual tests you'll face and the market making games, sequences test and brainteasers justify the cost”
“Tradermath is not only effective in preparing for quant interviews, it is also a very fast way to build general quick thinking skills. Within a few weeks I was better than all my university classmates at calculating in my head- something that is quite useful if you want to save time during a test.
Furthermore, Tradermath's costumer support does an amazing job with their quick and helpful replies.
Would definitely recommend!”
“Tradermath is an excellent platform for anyone looking to build a career in quantitative finance. The variety of games offered, including Mental Maths and Market Making, provides an engaging and interactive way to sharpen essential quantitative skills. These games not only enhance mathematical agility but also simulate real-world trading environments, which is incredibly beneficial for aspiring quants and traders. It is really helpful and beneficial for those who want to get into Quantitative Finance.”
“Amazing company: both the services they offer, as well as their customer service. I had a subscription and it’s well worth the money, tried a few other providers but honestly nothing comes close.
Also, I had some issues with my billing, and they stepped right in to solve them & address any questions I had. Huge thanks to James for all his help :)
Would 100% recommend 🙏🏻”
“Your website had helped me too much to keep up the momentum leading to rank up in global quant competitions and in many quant interviews ….thanks again for such a great resource…would coin that website as a asset for Quants”
“One stop solution for your upcoming trading interview! Specifically the Red Test of flow traders was on point, cannot comment on others as I am yet to sit for them. Highly recommended.”
“Very nice website, have used the tests for Flow Traders and definitely recommend this. In my opinion, there are no other companies that offer such tests so accurately for practice.”
“I have been an Data Enthusiast from a very long time now. Trading firms relies lot on data and strategies. I believe Tradermath is the right place to start your trader/quant learning journey.”
“tradermath offers the best quality prep for a number of firms - these are probably the only mental math rounds which closely resemble the actual tests you'll face and the market making games, sequences test and brainteasers justify the cost”
“Tradermath is not only effective in preparing for quant interviews, it is also a very fast way to build general quick thinking skills. Within a few weeks I was better than all my university classmates at calculating in my head- something that is quite useful if you want to save time during a test.
Furthermore, Tradermath's costumer support does an amazing job with their quick and helpful replies.
Would definitely recommend!”
“Tradermath is an excellent platform for anyone looking to build a career in quantitative finance. The variety of games offered, including Mental Maths and Market Making, provides an engaging and interactive way to sharpen essential quantitative skills. These games not only enhance mathematical agility but also simulate real-world trading environments, which is incredibly beneficial for aspiring quants and traders. It is really helpful and beneficial for those who want to get into Quantitative Finance.”
“Amazing company: both the services they offer, as well as their customer service. I had a subscription and it’s well worth the money, tried a few other providers but honestly nothing comes close.
Also, I had some issues with my billing, and they stepped right in to solve them & address any questions I had. Huge thanks to James for all his help :)
Would 100% recommend 🙏🏻”
“Your website had helped me too much to keep up the momentum leading to rank up in global quant competitions and in many quant interviews ….thanks again for such a great resource…would coin that website as a asset for Quants”
“One stop solution for your upcoming trading interview! Specifically the Red Test of flow traders was on point, cannot comment on others as I am yet to sit for them. Highly recommended.”
“Very nice website, have used the tests for Flow Traders and definitely recommend this. In my opinion, there are no other companies that offer such tests so accurately for practice.”
“I have been an Data Enthusiast from a very long time now. Trading firms relies lot on data and strategies. I believe Tradermath is the right place to start your trader/quant learning journey.”
“tradermath offers the best quality prep for a number of firms - these are probably the only mental math rounds which closely resemble the actual tests you'll face and the market making games, sequences test and brainteasers justify the cost”
“Tradermath is not only effective in preparing for quant interviews, it is also a very fast way to build general quick thinking skills. Within a few weeks I was better than all my university classmates at calculating in my head- something that is quite useful if you want to save time during a test.
Furthermore, Tradermath's costumer support does an amazing job with their quick and helpful replies.
Would definitely recommend!”
“Tradermath is an excellent platform for anyone looking to build a career in quantitative finance. The variety of games offered, including Mental Maths and Market Making, provides an engaging and interactive way to sharpen essential quantitative skills. These games not only enhance mathematical agility but also simulate real-world trading environments, which is incredibly beneficial for aspiring quants and traders. It is really helpful and beneficial for those who want to get into Quantitative Finance.”
“Amazing company: both the services they offer, as well as their customer service. I had a subscription and it’s well worth the money, tried a few other providers but honestly nothing comes close.
Also, I had some issues with my billing, and they stepped right in to solve them & address any questions I had. Huge thanks to James for all his help :)
Would 100% recommend 🙏🏻”
“Your website had helped me too much to keep up the momentum leading to rank up in global quant competitions and in many quant interviews ….thanks again for such a great resource…would coin that website as a asset for Quants”
“One stop solution for your upcoming trading interview! Specifically the Red Test of flow traders was on point, cannot comment on others as I am yet to sit for them. Highly recommended.”
“Very nice website, have used the tests for Flow Traders and definitely recommend this. In my opinion, there are no other companies that offer such tests so accurately for practice.”
“I have been an Data Enthusiast from a very long time now. Trading firms relies lot on data and strategies. I believe Tradermath is the right place to start your trader/quant learning journey.”
“tradermath offers the best quality prep for a number of firms - these are probably the only mental math rounds which closely resemble the actual tests you'll face and the market making games, sequences test and brainteasers justify the cost”
“Tradermath is not only effective in preparing for quant interviews, it is also a very fast way to build general quick thinking skills. Within a few weeks I was better than all my university classmates at calculating in my head- something that is quite useful if you want to save time during a test.
Furthermore, Tradermath's costumer support does an amazing job with their quick and helpful replies.
Would definitely recommend!”
“Tradermath is an excellent platform for anyone looking to build a career in quantitative finance. The variety of games offered, including Mental Maths and Market Making, provides an engaging and interactive way to sharpen essential quantitative skills. These games not only enhance mathematical agility but also simulate real-world trading environments, which is incredibly beneficial for aspiring quants and traders. It is really helpful and beneficial for those who want to get into Quantitative Finance.”