The certification you are looking at is the
CompTIA A+ certification (not A++, but I can understand the mix up).
The A+ certification is a vendor-neutral certification (and recognized industry standard) for desktop repair and support.
As for a book, I highly recommend Sybex's
CompTIA A+ Complete Study Guide. It is CompTIA Authorized Quality Curriculum, and it is loaded with almost everything you need to know for the exams.
As for courses, it is a good idea if you can to obtain education from a reputable source such as a college, university, polytechnic institute, or
somewhere which is a part of the CompTIA Learning Alliance.
In the end, make sure you write your exams and obtain your certification from a legitimate and authorized testing center, such as one provided by
Prometric.