1. Take notes at ordinary times, remember the knowledge points, and find a topic with such knowledge points to practice after class.
2. Sort out the test papers of each exam, sort out what you don't understand and understand them one by one.
One week before the exam, do these things again to see what you don't understand, and then ask the teacher (be sure to understand)
The examination paper is very important, clean and concise. If you don't understand, write the formula first, which is graded. (Try to write what you know)