I first had an on-campus interview with a recruiter which was mainly questions about my resume and work experience. I was then invited to the on-site interviews which consisted of three rounds: one asking about my resume again, one where they give real-world problems and see how you would handle the situation, and one case study. My advice is to RELAX! They want you to succeed, but also need to make sure you can handle sudden pressure and solve problems logically.