We were given an aptitude test which was mostly mathematics and statistics as well as general knowledge to test the IQ. The aptitude test was not related to the job I was applying for so that was quite off putting and surprising. However, it made me realize that not all interviews will be related to your technical work so it's important to be informed all round.

Online application, then a written test which I didn't pass to proceed to the in person interview. Long waiting process but overall very through and based on merit, The questions had choices section and 2 essay questions there may be some math and graphs too. All the best to others.