1. Preview
Read text before class so that you can know what you need to pay much attention to in class. In this way, you can listen more seriously in class.
2. Take notes in class
Important language points, grammar rules, useful expressions and key words are what you need to write down.
3. Organize notes and read them aloud after class.
In this way, you can have a better understanding of them. Reading aloud is a way to improve your pronunciation.
4. Read widely
Reading widely is a good way to improve your reading ability.
5. Talk in English
You can talk with your teachers and classmates on a small topic like the weather ,sports and so on. And you can debate with them on a current affair.
I think if you can do these, you can improve your English a lot. Dear friends , English is very important nowadays. We must try our best to improve it.