There is no one-size fits all approach to determine how long you should revise for your exam. Nevertheless, there are ideal steps you can take to understand the best frequency for your exam revision. You should first get an overview of the course materials covered. This will help you plan out your exam revision. Next, gauge your understanding of the course materials by testing yourself with practice questions. Based on your self-test, you can determine an ideal frequency for your revision with the spaced-learning methodology.