Preparation method of self-study exam
Be sure to know the batch number of the book. Don't buy the wrong book, or you will fail in the exam, so you'd better make sure the book is correct.
Then write down the key knowledge to remember, and it is best to buy a tutorial book, which can make learning easier, which will help friends who can't enroll in the study class for self-study.
The second is to take the exam first, which you think is relatively simple. In fact, you should also take the exam according to your own ability. If you can't take four subjects at a time, then you can take two subjects, which can be decided according to your own ability.