Certainly, AP Physics C prep books won't cover the entire exam. But has anyone still found them useful for their PGREs? (considering that basic 1st year physics is the plurality of the material on the PGRE, and that there are no other timed multiple choice tests other than the 4 official PGRE books).
And if so, which one do you think is most helpful? I'm thinking about Barron's since Barron's books are generally considered to be harder than the real exam.