I am wondering what test prep book I should get for SAT I. I know College Board has its own book for SAT I, but it seems a bit outdated, if that matters or not. There are many others out there, so there is a wide range to choose from.

Also, I may need to work on my SAT I Vocabulary. It would be great to get a book that includes all parts in detail so that I don’t have to "juggle" between different guides, but I will not mind if necessary.
What’s the ISBN number for the SAT Lesson Book (Kaplan)?
Nevermind. I found the ISBN number.

One aspect that bugs me is that if I use CollegeBoard’s book, I am afraid that the guide will be biased as CollegeBoard is the one who administers the paid tests, disadvantaging the student? Are my fears ridiculous?