Memory Supercharger. Use that at the end of your study review session. If you have used it regularly you can relax on that one.
If you know you are prone to exam nerves then your memory probably isn't a problem but anxiety is. In the lead up two exams use Anxiety Free. Allow at least five days before the exam using that Paraliminal once-a-day. Use Personal Genius on the morning of any exam.
AlexK