Don't forget to study for the exam. It should be a simple review, but if you've done poorly, you'll probably do poorly again unless you study. Look over each chapter's review sheet and understand the terms. The exam will mostly consist of questions from previous tests and quizzes. Remember, you can come in to the lab during study hall or after school to look over your tests or get some help with what to focus on.
I expect everyone to do incredibly well on the exam. Study hard, get some rest and do your best!