There are CompTIA books. There are other books you will find with a Google or Amazon.com search. You can possibly pass the test, but you won't know much.
I would read the latest edition of Scott Muellar's book on repairing and upgrading PC's, and a first class Networking book, or at least Networking for Dummies and Wireless for Dummies. A good text from a college or trade school would be useful. I would also read a comprehensive text on Windows XP, and another on Windows 98. Also issues for the past three years from CPU, Smart Computing, and Maximum PC.
Basically read everything you can, and understand everything you read.