So stressed about this exam that i'm afraid i'm gonna forget everything and fail?

This is my english lit/lang exam. I've focused so hard on one side of the paper, the side with more marks (an essay question on Hamlet) that i've managed to get continuous a's in all of my practice essays. However, the other side of the paper, i've neglected ALOT, i'm trying to learn all this stuff and its not going in, which is making me panic further about my hamlet essay as i'm scared nothing will come to me in the exam. I can't fail this a level, but i'm stressing out! I know i'm capable of doing well but i'm afraid my current frame of mind will cause me to fail...