The grammar of this course is all learned in high school. University is just the expansion of vocabulary. How to beautify your writing with some advanced words and rhetorical devices? In CET-4, the score of the composition is 150, and then the university attaches great importance to listening. Listening in Band 4 accounts for 150, and composition and listening account for a large proportion. Therefore, they are the focus of training.
If you fail English in the college entrance examination, ordinary colleges and universities will not admit you unless you do well in other exams and have no national certificate of Band 4. Finding a job after graduation is a problem, so it is very important for college students to get good grades in English.
I hope these can help you!