Count and recommend 400 classic questions of Li Yongle. Others are not recommended, because I use 400 questions and feel good! However, if you have enough time, you can do it several times more. If time is tight, it is more practical to do it several times! A classmate around me took the math test 143, and he only reviewed the whole book and the real questions, but he paid attention to summing up instead of doing the questions for the sake of doing them! Remember that greed is the key to the problem.