From a Technology Teacher (Score 1)

I've been teaching on Long Island in NY for 11 years, for the past 4 years I've used books from GoodHeart-Wilcox for my Computer Information Technology Course (PC Repair and troubleshooting). The only other books I use are Cisco Press for the Cisco Networking Academy Certifications and SDC Publications for our AutoCAD classes.

The book below does a good job of breaking down key concepts, identifying important terms, and exposes students to sample A+ Certification questions. It is not a perfect A+ Prep book, but a good start and has worked out great in my classes.
Hope this helps.

Computer Service and Repair: A Guide to Upgrading, Configuring, Troubleshooting, and Networking Personal Computers
http://www.g-w.com/products/detail.asp?id=108

If you want more info contact me at: b.buonomo(at)wi.k12.ny.us