In short, don't increase the burden because of study, you must be interested in it to help improve your grades!
In the listening part of IELTS, we should generally pay attention to grammar and control the tone of the speaker when listening. There is really no good way to recommend the oral part. You must practice, and you'd better find someone to practice with, so that you can be in an English environment.
Every time you practice, you'd better record a sound to see what's wrong with you. At first, people will be confused, and the content behind you will be confused. But after more practice, all problems will be solved. The content of the exam need not be too rigorous, but you must have something to say. There are a lot of materials in IELTS reading. If possible, try to give priority to the Cambridge series.