I like to ask the candidate who appear for PMP exam that:
1. You should eat light food, while appearing for the exam.
2. Take a water with you.
3. I found many candidate studing in the examination hall before appearing for the exam. Dont look at them, it will make you tense.
4. Relax for 2 hours before appearing for exam.
5. It is very hot here in Dubai, so I asked my friends to drop me, thou the centre was just 15 minutes walk from my office. Physically also I was fit.
6. Dont discuss about PMI chapters with your friends who also appear for exam. It will confuse you.
Hope This will help.