Before the exam
Believe in yourself. If you prepare for your exams properly you should do fine. Your teachers have worked hard to make sure you have studied everything you need for the exam. They believe you can do it and so should you.
Don't bottle things up
If the exams are making you feel worried or depressed, talk to your friends, your parents/guardians or your teachers. Don't bottle things up. You're not the only one to feel worried about exams - we've all been there. Remember, everyone reacts in different ways to exams.