ehhhh well nub has good advice. Oganization will cost you as much time as you save, only the stress is better when your organized. Some people work better organized.
When I first went to college I didn't know really what I was doing, short story is I had some poor study habits, cause I never took high school seriously..... The thing that messed me over the most was some of the classes will give you a syllabus at the begining of class, and if you don't know your suppose to be on that day everyone will be talking greek, and the instructor/prof isn't going to stop and explain what you should know.
If your going to be taking a class, find out the required book. Skim through the material, get an understanding of it before you ever get into the class.
Find a place that you can study/work at, this was another big problem for me, as I had sooooo many distractions. I actually find I have an easier time doing work or learning when I'm not at home.
KNOW YOURSELF, know how you learn, and then take advantage of your strengths. Theres a test for this, but I wouldn't know where to find one for free. Take a personality test, it'll help you understand things you don't know about yourself, as well as some you do know.
Have some time out to have fun, entertainment, whatever, and I don't mean sitting in front of a tv jerkin off....... without relaxing you'll lose your focus, and eventually crack under the pressure(this is what did me in the last time I was in college).
Make sure if your going to be living in a dorm that its some place you can sleep, and theirs no b-holes going in and out at 2 am.