You start in a conference room with 3 other students and wait for your turn to be interviewed. Each person is interviewed by a different pair of interviewers. (One knows all about you, the other knows nothing.)
After you're done, you go on a tour of the school.
After that, you go over a few things, and you're done.
As for what questions you could be asked...everyone was asked something different. They changed it so that not everyone will have the same interview questions. The people interviewing you choose from a bunch of questions. Everyone in my group had different questions.