Just do the last 10 year, and don't draw too many pictures. The papers in front, no matter the type or difficulty, are much worse than now! I suggest buying this book. There are still many postgraduate entrance examination questions on the market, which can be found in Li Yongle or Chen Wendeng! You must do it several times before you can understand the topic. The problem is not big, we must pay attention to summing up! Don't rush to do the real problem at the beginning, put it behind, don't waste it!