I would say study study study. If you can get your hands on a computer, walk through the things they tell you about in the books. I am a visual learner, so I have to see things as I learn them.
Try to find computers with different versions of Windows. Learn how to do things using the start menu, or shortcuts. There are also practice tests you can take that will show you your weak areas. In my case, those tests helped me a lot.
Read over the affect of static electricity and safety... you will see questions on those!
I think the hardest part for me was the different ways one can do things in windows.
As with all tests, get a good nights sleep, eat a good breakfast and give it your best shot.
"In a world where you can be anything, be yourself." ~ unknown
"Fall in love with someone who deserves your heart. Not someone who plays with it. Will Smith