It would depend on the exam. But in general I can suggest that:
- Do not forget that exams are a way to show your weaknesses and strengths in that specific topic.
- Keep calm and remember that you can make better progress when you are calm.
- Organize your study materials. like books, class notes, etc.. and organize them in manageable chunks.
- Create a study schedule and stay organize.
- Find a study group if possible and if you function better studying in a group.
- Seek help when needed. Don't hesitate to ask for help if you need it.
- keep practicing.
- Try to make the most out of it. 

Good luck with your exam!
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