You know what? Everyone can say "Studies say" and "It's been proven," but weed's like any other drug. It has various effects on various people, not all of them effects that show up in what very limited studies have been done. I found it robbed me of my motivation to do anything--mostly the relaxation/couch-lock effect. And it affected my memory for up to three days. If you think it's giving you problems and things are better schoolwise without it, then go with your own response and abstain. Just like jaGerbom said, college and grades should come first.