I would read
PR and do the sparknotes practice tests. Personally, I find that the sole difficulty on the test is going over human anatomy (primarily because it was the thing we least covered during AP last year), so going over anatomy (i.e. lung structure and function, heart, nervous system, immune system, musculo skeletal etc) will help give you a good amount of "free points." If you had a 660 last year, you probably just had a lot of silly mistakes-- a 700 should be attainable in the post AP period relatively easily.