Associate

Interviewed out of law school, as part of their Alternatiive Professional Degrees recruiting. From the 10 or so people I met, about 5 were from a STEM discipline, with another 3 or so from medicine. Not many lawyers.

Rd 1:
The problem solving test was not difficult, and I'm sure most people who successfully completed high school math at a relatively competitive public school could get it right. The trick is finishing it in time. Nonetheless, McK sends you a sample test before test day and samples are also widely available on google.

Also consisted of a group case interview exercise. Our leader was pretty friendly and it did seem that his main concern was familiarizing us with the process, knowing none of us knew what to really expect. They say this group exercise is not evaluative--however, the leader does take notes (and it was referred to in Round 2).

Rd 2:
Three interviews in four interview slots--will have down time.
One of my interviews was by videoconferencing system. They say it's because the interviewer "couldn't" make it--however, almost everyone else I've talked to (including non-APDs, interviewees on other test dates) all say that they all had video interviews. So I think it's intentional to throw you off balance. The key for this would be to get over the uncomfortable awkward lag times in video conferencing system.

Otherwise, interviews in general are pretty structured. The interviewer reads a case out of a binder of prepared material. From the question asked, it's pretty evident at least one piece of evidence that's missing. When you ask for it, they'll give you a sheet of paper with a table or something, which often includes information that you didn't ask for--but once you see it you can figure out how to make use of it. In all three of my cases, however, I had more than one sheet, so keep your eyes open.

Otherwise, standard case interview format. However, it really seemed like that there was an "answer" that they were looking for or were trying to lead you to. If you think you are gonna disagree with the direction they're taking you in, you will be challenged hard, and you may have to fight through it. Or maybe fighting itself is not allowed and you're supposed to quickly change your line of thinking.

All in all, compared to BCG, much more structured, regimented, and with an answer in mind.