Emy,
First off, It is 1am. Go to bed. That is part of your problem. <3
Secondly, we all believe in you! I know you are feeling stressed out and anxious and that this exam is important to you, but it IS just a test. You can only prepare so much and if you are procrastinating, it might even be a sign that you've prepared enough.
Picture yourself walking into the exam location, exhaling, and then kicking that tests ass, because that's exactly what's going to happen.
We already know the ending to this story, and that's "Emy is going to kick the test in the butt, relax for 15 minutes, and then go to China."
Take the time you need to prepare, pop in if you want the distraction, but take care of yourself! You'll be in my thoughts and wishes as you prepare. Best of luck though honestly, I don't think you'll need it. :)