You should have a plan and small goals, such as how many exercise books to complete.
You must not be absent-minded in class and follow the teacher's ideas.
Ask questions, don't shrink back because of your own personality and other reasons, and don't be embarrassed. Although students can give you lectures, you'd better ask the teacher.
Take every exam seriously, big and small, and carefully summarize the mistakes and weak links in the exam.
When you are tired of studying, go running or something. Don't relax yourself. If you relax, you will never come back.
You can relax and play with your mobile phone, but enough is enough. It's best not to play games and pay attention to entertainment gossip.
Come on!