Take a bottle of water with you during the exam. Don't drink too much. Drinking water is not to quench thirst, but to relieve stress.
It's ok to bring cool oil or something, but I recommend bringing mint or Dan, which can be contained in your mouth. Bringing cool oil will affect others, and others have the right to ask you to go to the spare classroom, which will affect your mood.
Take a nap for 40 minutes, not more than 40 minutes, or you will feel sleepy.
If the lighting condition of the seat is not good during the exam, you can apply to the teacher for adjusting the angle.
Think about being happy, you can breathe a sigh of relief after the exam, and you won't be tired.