Vocabulary: It is conservatively estimated that Cobo English needs to master 7000~8000 words and 900 commonly used verb phrases. The focus of the Cobo English test is not how many words the candidates have mastered, but the reading, translation and writing abilities as mentioned above. Therefore, a sufficient vocabulary is enough. I suggest to review my familiar vocabulary in those years and then expand it a little. For example, you can look at the vocabulary of CET-5, the new TOEFL vocabulary and some GRE vocabulary.
Reading: you can do one of the corresponding college questions, or you can do one of the postgraduate reading questions and the six-level real questions. Some college English test questions are selected from the original questions of postgraduate entrance examination and the true questions of Band 6.
Translation: English-Chinese translation is relatively easy to do, but it is not easy to score. On the contrary, Chinese-English translation seems difficult, but it is often easy to score. So you should be more prepared.