Depending on your foundation, it's better to recommend "Five-Three Synchronization" (the blue one). Wang Houxiong's textbook has a complete solution (the knowledge is quite complete). You can also buy Wang Houxiong's book if you have a general foundation. In addition, Xue Jinxing's complete solution is not bad, and there is another book called "New Solution to Textbooks" that I have used. There is no need to buy too many teaching AIDS in Grade Two. The key is to do a good job in the study plan issued by the school and sort out the wrong questions.