I am trying the Warner Advanced book along with Barrons Math SAT Workbook. I stopped using the PWN book with students at 700+, as they generally get everything right in it and consider it easy. I can also give them the ends of real and made up tests.
I have a student who wants to do a bunch of whole practice tests, but he is averaging less than 2 wrong per test. I don’t think this is the best approach and it doesn’t work with tutoring, as there is not enough to go over.