I wish I knew how much waiting I would have to do post-school
Before I started school, I wish I knew that I would not be seeing my tests once I was done taking them. I remember after the first test, someone asked if we could see what we got wrong. Nope. And apparently administration didn't want us to talk about the test that we just took.
One of my friends from the program mentioned that the school needs a certain amount of people to pass otherwise they will lose funding. The school also has a good reputation for its graduates to pass the NCLEX the first time around. So if I were told this before I started school, I think it would've been helpful advice.
I'm not sure how your school will be like, but always remember not to second guess yourself. IF you have to change your answer, you need the proof that D is the answer and A isn't. Be confident in your abilities, but not cocky. Most of all, be open! It will be a great experience