Of course, you have to take notes and review a lot of materials. You can't find knowledge you don't understand, which is time-consuming and inefficient. You have to sum up the knowledge points that are easy to make mistakes in doing problems at ordinary times and take notes on important issues, so that targeted review can be efficient. Especially before the exam, instead of holding a lot of review materials, it is better to look at your notes. After all, time is so limited.