First of all, there is no class.

It's really important to find a like-minded friend who can take classes with you. It can help you understand what the teacher says you don't understand, and you can also urge each other. You can have a natural partner when you work in groups.

The second teacher's course may be too simple or too abstruse.

Simple lessons will make you want to stop listening. The teacher spoke so abstruse that everyone was afraid of difficulties. We all don't want to know more about what we don't know, which makes us less eager to go to the teacher's class and more willing to study at our own pace.

Third, you can arrange your time freely, you can study in the early morning or midnight to find your most efficient time, you can rest for a week at your own pace, maybe reading for a week in a row is more free, and the efficiency may be more in line with your personal habits.