How about the intensive analysis and expansion of Qin Tian's high score notes exercises? I bought the data structure and want to buy the other three. Others say that the high score notes of the rice ball are not good, so To tell the truth, I took four professional courses in Qin Tian in the postgraduate entrance examination the year before last. I feel that except for the data structure, the other three subjects are average, which is not as good as Wang Dao's single subject book. I suggest using Wang Dao's single subject book, and later you can buy a set of simulation questions of Tianqi to do, and find out the feeling. 408 is not easy to test, come on!