Don't worry. Nervous? I think a few dozen other people in that class are, too. =P

My advice is to keep cool, and you'll pull through just fine. I definitely have confidence in you, and the most important thing is to have confidence in yourself and your abilities. If you have that, you'll be able to ace that exam. If you don't, just have the pleasure of knowing that your friends do.

Good luck, Taka.

I'd say it's pretty fair that you're feeling stressed just before the exam. On the plus side at least it compels you to revise harder and brush up on more areas than if you were feeling laid back and relaxed. That said, you'll probably be fine and find it going better than you expected. Good luck with that.