You can do a few things...
1. You can get the "party animal" out now and just go BUCK NAKED WYLD. Get the "fun" times out of you now. After you're on academic probation and your parents are near to killing you for wasting their money, you might then have some motivation.
2. You can focus yourself, and make the effort. Things aren't going to be easy, you just have to push yourself. I don't know if you are a very social person but why not try study groups or hook up with some people in the class and read/study/chat with them.
3. You can always buy cliff notes to the book, who care about reading, as long as you get to party, get good grades, what does it matter that you actually read this lame/boring book?
4. You can pay someone to write your book reports and write out other miscellanous stuff.
5. Listening to music while reading sometimes helps me stay awake.
6. Find what you want to do with your life and perhaps that would be enough motivation.
7. Or you can quit school and become a PORN STAR!! PWNED!
Good Luck!