Two interviews, first interviewer was a bit nicer and informal, the second was more formal. The experience overall was more of a discussion than a "test". After a brief motivational and experience part, there was the case (quite doable, but got confused on numbers in the second case) and then Q&A (very important!). First case was a cost-benefit analysis of a governmental initiative, then an M&A case. Messed up on second case, will try again next year!