Your exam results reflect the amount of effort you put in. Preparing for exams should be an ongoing task and not left to the last minute. Cramming the night before will just leave you tired, stressed out and unable to remember the information you need to recall.
Review course notes shortly after class to confirm your understanding. Develop systems to remember key information such as highlite textbooks, make notes in the margins, create cue cards, or mnemonics, whatever system works for you!
Make sure you know the date, time and location of your exam and show up on time and confident that you are well prepared. Read the questions carefully to ensure you answer them correctly. Answer the easier questions first to build confidence, watch your time and attempt all questions.