If you're studying I suggest a good study group. Good as in no one dicks around or leeches off other people's work. I find it helpful to discuss material with other peers who are serious about it. Just talking about the material will show how much you understood it, with other peers, they might reveal information that could prove to be helpful for the test or paper. Then again this only works for certain classes for me at least, with math it's a bit different but if you stick to good study groups you'll definitely find someone who's very knowledgeable about the material.