Got the interview through campus recruiting. First round consisted of an half hour 1 on 1 interview, behavior + simple technical questions. After that, there's a math test (probability, combinatorics, etc) that's half hour long. A week or so later, got a call to schedule for a super day. Met both trading and quant people. Got a couple brainteasers from the 5, 6 people I talked to throughout the day. Felt that they cared more about the fit vs. technical skills.