Yes, make sure you take the quizzes. Also try not to get too nervous. I failed the first time I tried. Well, I failed the software part but past the hardware part very easily. This was while I was still in college and had only been interested in computers for about 1.5 years...
Make sure you know ALL the ways to do things in Windows. I'm guessing they have Vista on the test now... They had 98 on it when I took it and I didn't know a dang thing about 98. I think I failed by like 2 or 3 questions. (It's a points based test but I think the amount of points I failed by were equal to 2 or 3 questions, roughly). I passed it the next time I took it relatively easily.
Good luck.