I didn't make it past the math test. It was a series of math/probability questions (16 in 20 minutes I believe) which are very difficult given the time allotted. You have to complete them in order and cannot go back. You also have to manually enter a number for most of them so luck cannot save you. There were probabilistic questions (combinations/permutations, Bayes) along with one or two basic calculus questions. They are definitely not excruciatingly hard but would be very hard to complete and get correct in the allotted time. The complaint I have is that the questions the recruiter sent me to prepare for the test were not an accurate representation of the actual test at all. The questions were MUCH more demanding than the examples and I feel like I would've passed had they have been an accurate representation.