I agree, if there's a school you currently go to, or went to in the past, see if their pre-health/advising office offers mock interviews. If not, you could also contact Kaplan or other admissions prep companies and see if they do. I thought I remembered reading somewhere that they do this, but I could be wrong. Otherwise, I'd ask fellow students who have already been on interviews to mock interview me. Or if you know any current med students. I agree that mock interviewing with family, or friends who haven't had a med school interview wouldn't be as good practice. And the mirror doesn't work either in my opinion. I also tried practicing answering questions out loud in the car while I was driving before my first interviews, and it was not very helpful either. A good mock interview is definitely the best practice. (Or other job interviews if you have them). Good luck!