Hey
There are many ways that people study and certain things work for certain people. For example my friend Matt can only study while listening to his iPod. I cannot- I need total silence so I can concentrate. So, the things that help some, may not help all. But here's what works for me...
-No outside noise, turn off the tv, radio, cell-phone, instant messenger, etc. (try to limit all interruptions so you remain focused)
-Highlight important facts that you need to know (it reminds you what to go over again and review.
-After you are familiar with the material you are studying, grab a friend or a parent and ask them to quiz you.
-Make up a mock-test for yourself and see how well you do. This will help give you an idea on how much more stuying you need to do.
-Take a mini-break halfway through. A little snack and time to give your eyes a break can help a lot.
I hope that helps a little. Ask your friends what works for them. Remember, everyone has their own study style. Find what works for you!