Instruct: Classify an Amazon review into positive or negative sentiment.
Query: The definitive book on the subject...

This book is by far the best book on pc hardware/software I've seen with the possible exception of Scott Mueller's Upgrade/Repair 10th anniversary edition. If you work through this book and understand it you'll not only be able to pass the A+ exams, but be able do the job of an A+ technician fairly well. That being said, this is not a book for the experienced technician just looking to grab a quickie certification... for you folks, just grab a quick guide and beef on your weak spots. For the newbies, this book seems intimidating, but it'll make a technician out of you. No paper certifications with this under your belt. So buy it, read it, sleep with it, and learn it inside out. And when you're done, you'll be very glad when you go to your first technical interviews... you'll have the headstart on them all >:)