Using multiple sources is always wise. If you have already read (and understood) your book from school, then using the Exam Cram for a couple of weeks is a good idea. Make sure you practice as much as possible on a live or virtual machine. Good luck.
Sybex how many pages? I'm still trying to finish my A+ form Sybex.
Basically the school book WILL NOT HELP WITH THE EXAM I got a 50 percent like 5 times and all the information was basically A+ material. I was using the selftest testing engine.