Scott Mueller writes some good tech books. I second that recommendations.
I also nominate the Exam Cram books. I've used them to study for A+ and Network+ certs. They're easy to read and very full of good info.
Of course, just reading the book isn't going to really prepare you for the exams. If you don't have a computer you're willing to work on, then get some old beater rig to take apart, swap parts, and don't be afraid to screw it up. It WILL happen.