How can I prepare for my German class (after so long without practice)

I’m planning to take German 3 next semester, after having a two-year break after finishing German 2.
I still have my German book (which was designed to last through German 3), but I don’t believe I’ve got any of my old notes laying around.

German 2 was just the second semester of beginner’s German, so I was never highly fluent in it, and it’s not like I could just crack open an old German novel to brush up.

What kind of things should I do to unlock/unlose the cornucopia of German knowledge that’s locked away somewhere in my brain?
I was thinking about reactivating my LiveMocha account, but it was only ever a good system for vocabulary, not really for sentence structure or anything of the nature.