I think it is necessary to attend.
On the one hand, the remedial class keeps abreast of the latest exam trends, and will focus on what kind of English questions will be produced this year (some of them are optional questions in the syllabus).
On the other hand, English for postgraduate entrance examination is different from CET-4 and CET-6 in examination points and skills. Good grades in CET-4 and CET-6 don't mean good grades in English for postgraduate entrance examination. However, you have a good foundation in English, plus the skills and experience gained by attending remedial classes, you can at least get twice the result with half the effort!
Third, reviewing suggestions is to develop a good habit of answering questions during practice. Don't do too many questions, don't repeat the work, and form a quick and effective answering idea with the help of the tips of the remedial class.
There are better remedial classes and reference books on the market, such as navigation, navigation and Cao's reference books.
The postgraduate entrance examination took the navigation tutorial class. Only reported the sprint.
In fact, as long as you find a bigger one, you can do it in the field of full-time postgraduate entrance examination.
Don't buy too many books, just a remedial class.