If you feel really stressed before an exam. Here´s some advice to help you.
You should make a list of everything you need to study. You need to be organized with the topics you have to study, if you make a list probably you might read every subject.
Only spend time on things you have to do. Don’t get distracted by things are not important, you can watch TV or use your phone after your exam.
Talk to a partner and ask for topics you don’t understand. If you need some help with some subject. You could ask to a friend about the topic you don’t understand. They will help you.
You should think of ways to sleep well before the exam. You should think of ways to sleep well before the exam. Because doesn't good idea that you take the exam very tired, and could have mistakes.
You shouldn't use your computer to play video games during the exam period. You shouldn't use your computer to play video games during the exam period, because is necessary that you are focus in your study.
Adrian - Alejandro