Just do what you usually do to calm down and center yourself. Meditate,pray, deep breathing. If you mind is racing you can't apply yourself properly.
Myself, I knelt in prayer before I left and asked for clarity of mind, the ability to reason well, and to remember the things I had learned and expressed gratitude for the chance to take the exam. (I really was glad I had the chance to do it, as stressful as it was.) But, that's how I handle things. I'm sure you have things you do to calm yourself.
Good luck...and ignore everyone around you. If they fidget or look tense, don't pay any attention. Part of it is a mental game, too. The proctors in my testing made us feel like I was barely "worthy" enough to enter the exam room. When they delivered the rules they it sounded like they were reading the statement right before the switch is thrown at an execution.
I just had to concentrate on the test and pretend I was the only one there.
Again, it'll be tense but you've taken tests before so the environment isn't unfamiliar. (To add to my stress, I had graduated from college 13 years earlier so it had been awhile since I'd been in that kind of setting.)
Where are we going, and why am I in this handbasket?
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