KPMG Associate Consultant interview questions

I was invited to apply for a role as associate consultant by a recruiter of KPMG based on lots of previous interaction that we had. She discussed this with the hiring partner and so I applied. The first round consisted of a personal interview. The second round of a case interview and personal interview. The last round consisted of a interview with a peer and the hiring partner. At the end, I got rejected based on my motivation whilst they knew everything about me and so my motivation, they invited me based on that information to reject me at the end. In retrospective one of the most comical processes that I have experienced.

It was very hard since the interviewer has 17-18 years of experience. he asked me conceptual questions regarding dbms and os. the interview lasted 20 minutes and it was my first interview which went really bad.