Just do your best in the exam. Make no mistakes from your side. Understand the question. While solving the problem write all the steps clearly. For construction take extra care to explain each and every step that you are doing. While doing proof in geometry or any other topic, please make sure you are writing all the steps clearly and along with the thoerems used (in geometry problems). I am sure you will be able score full marks in your exam.
Best of luck in your exam.