If you don't have much time, don't spend too much time memorizing words. I suggest you get several sets of real questions to do. The real question is the key to passing CET-4 and CET-6, and it is the most convenient shortcut.
In the process of doing real questions, in addition to being familiar with the questions and understanding the knowledge points, the key is to find the answer method.
Listening: Listen more. Be sure to listen carefully and do the listening part of the real question seriously. In the process of listening, you should learn to take notes quickly with a pen and write down more useful information to facilitate answering questions. Of course, you must check the problem first.
Single choice: it's for grammar and vocabulary. The key is to learn to use exclusion, look at tense, voice, consistency of sentences and so on.
Reading: You just need to do some reading properly, because time is tight. Look at the topic first, and then take the topic to the article to find the answer, which can save time.
Composition: read more real questions and model essays, pay attention to coherence in writing, and use more conjunctions; Don't be too single in sentence patterns, learn to express the same meaning in multiple sentence patterns, such as inverted sentences.
These are just my methods of taking CET-4 and CET-6. I hope they can help you.