Sort out the wrong books, analyze the reasons for the mistakes, and avoid making the same mistakes again. Be more cautious about simple questions, because the simpler the question, the more likely it is to make mistakes (so am I). If time permits, it is important to slow down a little and make the meaning of the question clear. If necessary, write some key and easily overlooked conditions in pencil and do them carefully. If there is still time, check it again ~