I don't know what your classes are, so it's hard to give specific study suggestions.
If you have a smartphone or an iTouch, you can download some apps that will help you. My son regularly uses a flashcard app that is attached to Quizlet.com, a website that helps you makes flashcards, but also HAS flashcards others have made. This may be helpful for you, depending upon the subject.
If any of your subjects have to do with learning a foreign language, "Byki" apps are helpful with foreign languages.
I don't know where you are going to college, but I just have discovered a group called AHHEAD (http://www.aheadd.org/pittsburgh.html) that provides help and structure through peers and mentoring for people on the spectrum at college. There is a rather large cost associated -- but, having read about them, I wonder if it might help you figure out the type of help that you need, and maybe you can find more help when you have the specifics of what you need -- and then can ask at your college's disability office. You may be able to get some services through this office, or another, for free.
It's great that you are in college at 31! I'm just starting up again at college at 52, so you're a young whipper-snapper!