I'm Cai Dong who took the 13 exam. Tell you 660 questions. You don't have to do this book. . I did it then. . I feel that many questions are still good. . However, it is not the same as the real question routine of the postgraduate entrance examination. . . If you want to do it, look at the line generation section. . Now I mainly review the whole book. . It is important to review the whole book. .