Whether to enroll in class or not depends on your English level. BEC business English is actually a kind of specialized English. It learns many technical terms in business, which are not taught in general English courses. English learning is not achieved overnight, but needs long-term accumulation. Words, grammar and listening are the most basic, but the most important thing is oral practice. Listening and practicing more is the most effective. It is best to communicate with foreigners frequently, and exchange language and culture can also improve the level of foreign languages.

Cambridge BEC Zhenti Collection, Volume II and Volume III, two books, People's Posts and Telecommunications Publishing House, which are similar to these two books, and two simulation questions, which are also from People's Posts and Telecommunications Publishing House, add up to a full set of *** 16 questions, 8 sets of real questions and 8 sets of simulation questions.

A vocabulary manual, I think BEC Intermediate Vocabulary published by New Oriental is enough. The title is: Selected Intermediate Vocabulary of Cambridge Business English, Yan Qun Publishing House.

There is also a book, PASSBEC's new Cambridge Oral Business English Test Manual, Economic Science Press.

The new Cambridge Business English Test Manual (Intermediate and Advanced) covers everything, including vocabulary. It is a big one, but it is not so targeted. The spoken language and composition in it are worth reading.