1) Not 100% sure on that. I know the hours generally are pretty sucky. They have extended hours around final exams. We have study rooms that are accessible 24/7, and most people tend to study off campus as who really wants to be here more than we have to? Lol!!!
2) For the most part, no. OSU is moving towards most exams being taken on ExamSoft. So you can see which questions you get wrong after it is released by the professors (which is pretty much the same thing, I suppose). Paper exams are not returned to us, and it is an honor code violation to have an exam you shouldn't have access to. You are always more than welcome to view the exam along with your answer sheet in the professor's office.
3) For now, yes. They don't really cost that much--$40 or so each semester. It just goes to cover the cost of printing. I believe they are experimenting with just offering notes online and not requiring you to purchase anything in hard copy (so this would be free). I think it's important to realize that your notes are pretty much your bible and everything you need to know for an exam is in there. You don't need to consult outside sources (ie, textbooks), which saves you a lot of $$$ in the long run.
4) Nope, semesters!
5) I think so! We have some of the best clinicians around, IMHO. Our professors go out of their way to be available to us (our cardio prof offered us his cell # the night before our first exam for last minute ?s because we were all freaking out...and that is the rule not the exception). We have pretty much every specialist available here (except exotics, which is a bummer), and our professors are all SO approachable and amazing. They truly want to get to know you as a person.
Sorry for the brief answers...going on 2 hours of sleep and need to be back at the hospital in 40 minutes. Let me know if you would like me to expand on anything. Hope this helps!