I have a potential job offer within the next few months with a significant salary jump. The only catch is I must posses A+ certification. I checked out tons of study guides tonight ranging from $29 to $90. They all seem to have a CD included with practice exams which I know I need. I'm wondering which is the best. Do I get more information in the costlier books? Are there any particular authors/publishers to check out or stay away from? Any advice is greatly appreciated.