It is recommended not to stay up late to review. No matter how important tomorrow's exam is, how much you have learned before going to bed will be recorded in your mind, and there will be no qualitative change in reviewing after staying up late. In addition, if you are not used to staying up late at ordinary times, you can't stay up all at once, or you will feel sleepy, depressed, inattentive and slow to respond after staying up late, and the exam may be worse than before. So why don't you have a good sleep and answer questions energetically, and maybe you will have an epiphany. The above applies to ordinary people. If you are not ordinary people, you won't know.