I graduated about a month ago and can give you some tips. Exercise as much as you can right now. Most students roll into another class due to injury. You will be much happier if you complete the program in the 13 week minimum. As far as academics go I wouldn't worry too much. You can't prepare for the academic portion in advance, but all of the course work is very easy. Just put some effort into it so you can have liberty on the weekends. It's the RLPs you have to worry about, but you can learn all about those when you get there.