none really. I only had about 3 questions. It was more like a conversation. The questions I had weren't even, why do you want to be a doctor or why columbia? It was more about my family and why I chose my undergraduate college.
I didn't prepare at all. Not a single bit. which worked well for this school because the interviews are so casual but I plan on preparing for the others. I think was more important to let your personality out, be friendly, engaging, personable. Just have a conversation, shows maturity.
What impressed you positively?
How relaxed and easy going the interviewer was, it really helped me because I didn't practice. I got the invite a week before the interview date and it was my first interview so it really took a lot of my nerves away. Plus, the students and faculty are so friendly everyone that walked past the waiting room
What impressed you negatively?
The facilities and the fact that so much of the first and second yr was lecture. All of the "classrooms" I was shown were huge lecture halls.
What did you wish you had known ahead of time?
Nothing but if you don't live nearby and want to sit in on a class, schedule this ahead of time so that you can do it while you're on campus for the interview, esp. because the interview day is not that long.