DRW Quantitative Trader Intern interview questions

90% Simple questions, 10% extremely hard. The total time is 30 minutes. It can not skip problems when you start the test online. Leave enough time for hard problems, either taken place in the beginning or in the end. The test is highly selective.

First-round is four probability and statistics problems, not hard. Then I received codibility test with two coding problems. Both are easy level; however, I forgot to include the edge case and did not pass this step.