Teachers teach indiscriminately, and students don't study in order, which will make students very confused and at a loss.

It is forbidden before the problem is formed.

When the problem has been formed, it will be banned and the students will resist. Don't wait until the time for study has passed before you study. Even if you study hard, it's hard to achieve anything.

Study alone

If you study alone, you will be ignorant without consulting your study partners.

Make improper friends.

Making improper friends will make people go against the teacher's instruction.

bad habit

Bad habits will make students neglect their studies.