I would study in groups more often, but tend not to for a few reasons:
1) I live on the opposite side of town from most who I go to school with
2) I'm type A and will tend to become the leader of the group, but I feel really guilty about it
3) I rationalize my thoughts about the facts, whether they're right or not, and I'm afraid that not only am I going to get the wrong answer, but I'll drag someone else down with me, as I can be pretty convincing.