I was a two time test taker as well. I reviewed my weak areas and worked those types of problems the most, but I also kept my strong areas fresh. For me, working on timing and organization of the references was key. To be honest, I never felt like I was solid and totally prepared. I felt kind of neutral for some reason. I was confident, but still concerned. I think your feelings are normal for a lot of people. Aside from working more problems, just focus on your strategy, timing, and organization. Try to remain positive going into it. That would be my advice.
I also found it helpful to ask this board a few questions on problems that stumped me. In some cases, I was still making silly mathematical/unit mistakes. Those types of mistakes will eat you alive, if not checked. Best of luck!