The process was quite fast : 1 - online test which regroups different tests, you have some calculus, logical and reasoning. At the end, you have questions and you are recorded, 2 - AC with mental arithmetic + physical interviews. There is a MCQ test with calculus on one page, it is written in very small characters and there are lot of decimals, so it is a bit confusing. Interview was mainly on probabilities and unfortunately I didn't have a math background.