How to improve the sense of existence and goodwill in the class?

First of all, you should be cheerful and sincere. When you do something wrong, you should first reflect on yourself, not consider what others have done wrong. When others ask for help, try to help them, and don't exaggerate what they can't help. Then others may think you like to brag. Actively communicate with classmates. When talking, avoid topics such as privacy.