Interviews were very laid back. I had prepared by knowing all about my personal essay, journal article essay, research I did in university, and writing out answers to the top questions asked by grad schools, mock interview with my supervisor, and of course maybe most important, tons of prayer, but in the end they only asked one question from all of that information. Basically it was a conversation, just getting to know you. There was one 1 on 1 interview, and there was one 2 on 1 interview, so you're interviewed twice by a total of 3 people. Afterward you eat and are shown around the most beautiful campus.
I have a degree in chemistry, 3.43 GPA, average MCAT, but I am not a typical applicant due to life experience.
Good luck!