If you correct the wrong book, you can extract some questions from it. I don't think these questions mean that you must copy them if you make mistakes, nor do you mean that you must cope with the teacher's examination. The most important thing is to record the questions and unexpected ideas you can't.
There may be some difficult questions that you will still say after reading the answers, but you can write them down in the error correction book and write down your thoughts. You can take them out when you eat, before you go to bed, or even when you go to the toilet. It is best to take it out and do it. The more times you do it, you will find that your mind will be more open and you will start to get along with the answers. You will find a better way. As the big exam approaches, you won't be like a headless fly. You can look at the revised edition to see your previous mistakes, or you can write down the commonly used formula skills in the revised edition, which is very helpful for reviewing before the exam.