As faculty at an ASN college I would say brush up on your math. If you can find out what calculation system your school uses and just practice, you will be so much more ahead of your fellow students. We use Dimensional Analysis, which I didn't use when I was a student, so I had to learn it to teach my students! I'm not from the sliderule days, but it felt like it when I was mastering this new way to calculate.
I agree with an early poster- relax and charge your batteries. Oh, and get a CNA job too! Seriously, working in a hospital or other patient care setting will put you ahead of your other students AND give you confidence. (And make you more marketable when you get out.)
Congrats and above all, enjoy. You will have the most memorable and intense ride, but it's worth it!