Only did the mathematical problem solving interview. No advanced technical knowledge required. Focused mainly on creativity within arithmetic and statistics questions. Focus more on showing your thought process than just solving the question since the interviewer is happy to help if needed.

First was a excel take-home task. Tedious and detail oriented. Took quite a while to be sure I had got it right - standard excel operations and looking at financial data (haircuts, different types of options). Then was brainteasers. First was a water content (classic one with 99% to 98% volume, what is change of weight), then a simple number theory question, where you had to spot a trick, then an adaption of the secretary problem with just 3 candidates - had to calculate expectation, then a slightly awkward speed, distance, time question. Next round was coding. You weren't allowed to run any code, which sometimes made debugging difficult. First question was return 3 largest numbers in a list (don't just do it naively, you want constant time), then adaptation of this, returning n largest numbers. My code was slightly buggy, as I didn't really practise whiteboard coding. I failed after this - next step was onsite. I decided to do a GDPR request, and it turns out the main reason I failed was for not being friendly enough - definitely a new one for me. I felt like I was matching the interviewer, but clearly you need to make more of an effort.