There's a lot of tips out there to help you. I've got a few that I'll share with you.
1.) Take practice tests. Most books now come with CD ROMs with these already on them.
2.) Study the boring/ difficult stuff first.
3.) Study. It's obvious.
4.) I can't think of anyone that didn't benefit from a study group. Make it fun- bringing beer tends to liven things up.
5.) Start from the last question first- I don't know why it helps, but it does.
6.) Answer all the questions you know first, then go back and do the others you weren't so sure of.
7.) NEVER change your answers unless you are ABSOLUTELY SURE you're changing them to the right one.
8.) Look for key words like ALWAYS, NEVER, ALL, NONE, or other exclusionary words. Usually, these are incorrect, but be careful because sometimes they are!
9.) Don't cram. Usually doesn't help. Set aside a time each day or every other day to study.
10.) REWARD YOURSELF! Give yourself reason to do really well. I let myself buy a new surfboard once when I aced an exam.
11.) It's not a race, but pay attention to the clock.
12.) BREATHE!! As long as you prepared for it and remember some of these tips, you'll be just fine.
PS- I was an instructor in the Air Force and wrote standardized tests for Air Education and Training Command. Told these tips to my students- NEVER had a failure.
Best of luck to you!