Positive imagery: Spend some time visualising a positive exam experience. This will increae your confidence, help with nerves and enhance your mood.
Your best performance: Think about a previous good performance. What helped you do well that time and how you will apply that tomorrow.
Your preparation: Boost you confidence by reminding yourself of how well you have prepared and how much revision you have done.
Focus on you: Focus on yourself and don;t compare yourself to others as this will make you feel stressed
A Good night sleep: A good night sleep helps improve creativity. problem solving, concentration and memory. This is more important than last minute cramming.