Initial interview through campus recruiting, mostly mental math and brainteasers. Next there was a rigorous two day onsite interview which consisted of everything from programming tests, aptitude tests, mock trading and 6 individual interviews. Very competitive process in which nearly every applicant was from an engineering, cs, or math background.

Received an assessment for 126 questions in 20 mins. Was not too bad all quick math and a lot of vocabulary. Not really a way to prepare for it other than brushing upon vocabulary.