The best thing you can do for yourself is go through the practice quizzes in the Learning Center - if you can get through those pretty well (and study up on the stuff you miss) you'll be okay. My two years was up and I just retook the test (and passed, thank you), but I definitely needed the refresher for some of the stuff I don't use or have need for. They're always adding new things there as well.
You do want to pay close attention to the wording of the questions. But you'll run into that in the practice quizzes as well.