-Normal online tests, not as bad as some other places
-A while after I got invited to a first stage interview with a senior manager. Normal competency based questions and then you're given a sheet to write notes about for 5 minutes; after which he came back in and asked questions relating to it. Normal things you would expect from internal auditing like what's the problem, what are the solutions etc.
-I was then invited to an assessment centre but couldn't make it so was given a final interview on a different date instead. Similar to the competency questions in the first half of the first interview. Got offered the job at the end of the interview.
Tips: Stay calm, Mazars seems like a very friendly company and in the interviews they were supportive and genuine. Also when they offer you water take it! Dry mouth can screw you over.