I applied through my school's career bulletin board. Although it was mandatory for trader candidates to do a logic test, business analyst candidates did not. The first interview consisted of a one-on-one interview where the interviewer asked both behavioral and case questions. A behavioral question was questions like "why did you decide your major, and why did you choose to go to this school?". My case question was "how many trays does a new restaurant need to buy at the beginning of the year?". After about a week, they emailed a prompt for a business proposal that was due in a week after the receipt of the email. If they like your proposal, they will send you up to Chicago for the last interview.