you pretty have to. you might know a lot about computers but you won't know everything, and the A+ covers other types of related hardware. The books and sample tests will give you most of what you need to learn.
Yeah that's pretty much what I was getting at. People seem to think if they can build a computer they can pass the test. Now I'm not calling the test "difficult" but there is a bunch of shit on there that you wouldn't normally need to know. FYI, I passed the A+ in 2000.
I bought this book, started reading it on Jan 2, just finished tonight:
http://www.mhprofessional.com/product.php?isbn=0071701451
Spent about $30 for it. A lot of it is "difficult reading" because its often boring, mostly basic, and a little repetitive. I did learn some stuff like basic TCP/IP details, and also some recovery console and command line utilities.
If I continue with the network+, which I definitely hope to do, I'll get the Mike Meyers book you linked earlier Database. His A+ book apparently is MUCH more popular than the Holcombe A+ book I used.
OK, I just wanted to make sure you weren't winging it. I assume you are taking the 2 tests back to back? They aren't long and that's what I did and would do today. Hope you studied enough, I'd hate to see you waste almost $400 on a shot in the dark.