Hang in there. Try to figure out where you were off on your answers and refocus on studying that material versus pushing it off. I'm doing the same thing you are: testing for SPD on 10/28 (2-weeks!!!!
) and follow it up with PPP on 11/9.
The overlap of content is so high that it made sense to study for these together and basically take them back to back. That said, don't give up. If you don't feel ready, then trust your gut feelings. Otherwise, hang in there and go back through the content. I have personally struggled with Ballast for studying. To me, their books are fact after fact after fact and it becomes overwhelming to study with. Kaplan will use diagrams, sketches, and seems to be more story-telling than an encyclopedia of information. A cross between the two is a good comparison, in my opinion, of exam-type questions.