Whew! I did it, with only a couple of minor mistakes. It really helped seeing others test before me, and see them mess up- I relaxed a good bit more then. Thanks everyone for your input!
Put it in your mind that it is not a test, just a regular class. You know your stuff already, so, be confident in that and have fun with it. You have already done this a few times succesfully if you're going for your brown belt. You'll be fine. Even at the start and during the test, make it a point to relax yourself and go with it. If you fail (which you won't!), there will be another test in the future. You have your whole life to pass the test.
Good luck to you!