First of all, when the teacher is in class, he should listen carefully and don't whisper to influence the teacher's lecture.

Then, do more exercises.

Also, read more books at ordinary times. If you don't understand anything, ask the teacher.

If you want to be admitted to Tsinghua Peking University, you can't just talk without practice.

Those schools that can enter Tsinghua Peking University are generally top students in the college entrance examination or some provinces. Only people with very strong learning ability can be admitted to these universities.

Of course, if you have a Beijing hukou, it will be easier than students from other provinces. But it doesn't mean that you can get a low score if you have a Beijing hukou. If you want to enter these universities, you still have to get high marks.