1, problem solving: 53, one book by Wan Wei, required.

2. Mathematics recommends Huang Dongpo's new thinking, and the combination of the two can basically reach a good height. Need to brush the topic to consolidate the foundation, and the difficulty of new thinking is above average. The wrong math textbook is also a very useful tool. The wrong question should focus on "simplicity and practicality" rather than pursuing perfection. It is just a tool to consolidate knowledge and check gaps.