They did a general intelligence test of 30 questions that took 20 minutes and was way too hard to finish for 99.9% of the population, so the point is to do as well as possible. Even you get less than 10 right, don't worry, I got a first round interview anyway. It was a phone interview was a 30 minute case interview. I got a call from a first year analyst and she jumped right into the case, which was a diminishing profits case. It lasted about 25 minutes with a bit of math, then a couple minutes for questions. She called back that night to provide feedback, very nice and helpful, and pass me on to the next round, which I declined because I accepted another job.