I have a new favorite Math 2 SAT subject test practice book! Dr. John Chung's version doesn't have much in the way of review information, but the practice tests are quite good. He does a good job capturing the "flavor" of the SAT II Math 2 questions. AND there are a whopping 12 practice tests!
That said, the book is not perfect. So far I have taken tests 1, 8 and 12. My past experience with practice books is that the first test is often good, but that the tests deteriorate from there. Test 8 was still pretty good, but it did require me to use the Law of Cosines three times, which seems excessive. Test 12 is not useable as a practice test because a printing error caused half of the math symbols to appear as little rectangles. I was still able to decipher most of the questions, but it throws off the timing for a practice test. This test could only be used as a source of problems, and then only by someone who knows enough to deduce what the symbols should be. A reviewer on Amazon complained that there was not a list of errata available. I may make one for my students. If I do, I'll share.