I don't know of any books other than Kaplan. If you go through every page, detail by detail in the Kaplan book, you should be okay. That's all I did (along w/ a lot of practice problems). Really, the math just tests you on basic concepts, nothing too tricky I didn't think. One thing that I did that was optional for the trig problems was to write out the unit circle on my paper during my break..I found that it helped me on 1 or 2 trig problems.
Just a side note.
But, overall, the Kaplan book should be okay. It's the only thing I used and it got me a decent score.