The pre-med advising folks here give interview workshops. I'm going to go to those as soon as they start up. Otherwise, I don't know that I'm going to do much. Seems that, since you don't know the questions, it would be difficult to practice anything more than being comfortable around people in positions of authority. Also can't hurt to come up with some general thoughts on the various ethical questions and state of medicine today. That's pretty much my plan.