You first apply online. then you get invited to write the PST ( Mckinsey problem solving test) which is a 1 hour 30 min test on problem solving. if you pass that test you get invited to a coaching session where you are coached on how to do a case interview and how to answer personal experience interviews, htis is not tested. you then get invited to the first round of case interviews with potential collegues or team leaders, three 1 hour interviews back to back. if your're succesfull you will get invited to 2 back to back case interviews with partners of the firm.