Many of your books will be available online through the school. Only one I would purchase is the one for Health Care. That will be one of your toughest classes semester 1. I wouldn't worry too much about trying to get ahead. Relax right now, you will need it. Program is very rigorous, but it is very doable! And the staff + administration are awesome. They all try to help out in any way that they can.
But definitely purchase the healthcare book for semester 1.
If you truly want to prepare, go ahead and memorize the top 200, what they're used for, and their generic names. Also learn how the American health care system works, in specific medicare A, B,C,D. Get familiar with terms associated with insurances etc..