There's been lots of threads on practice books on CC, and if you google "best books for SAT Math 2," you can see them. Here's one of the threads:
what's the best SAT II Math Level II prep book?
I used Princeton Review and got a 790, but it seems that many people like Barrons because they're more challenging. You could also try the Collegeboard's "Official SAT Subject Tests in Mathematics Levels 1 and 2" for the most realistic tests.
Good Luck!
