well i burnt myself out the first time by taking too many practice tests. even though taking preptests is the best way to improve your score, don't overdo it. also, i definitely concentrated more on my timing and skipping around with questions. you should definitely take it easy a week before the exam. if you're planning to take the exam in the same location that is also a huge and comforting advantage.
i think you're probably aware of your strengths and weaknesses, but don't forget to work on your strengths!!