Stop being here Spend more time studying in a calm place whithout anything to disturb you (like computer, television, cellphone...) Do your work before the day you need to hand it. Don't postpone. Start studying for your exams as soon as you have the dates. Just 15-30 per day is better than 3h in a row.
Oh, yeah, NEVER POSTPONE ANYTHING, and I mean ANYTHING. Been smacked in the face bigtime since december for postponing stuff, not even school stuff, but other things. PROCRASTINATION is the worst thing to do. Avoid it at any cost.