(1) popular science:

The Magic of Mathematics-the Source and Flow of Mathematics by Zhang

Wonderful mathematical garden series and ancient and modern mathematical thoughts

(2) Problem solving class:

Mathematical thinking technology-Author: Ji "Mathematical Beauty Preschool Education and Mathematical Discovery"-Author: Xu Xiaogen

"New Middle School Mathematics Problem Solving Method Book" High School Volume

(3) High-energy category:

Geometric transformation and geometric proof-Author: Xiao Zhengang's geometric treasures (up and down)-Editor: Shen Wenxuan and Yao Qingyang

(4) Interesting category:

Physical methods, mathematical curiosity and mathematical kaleidoscope for solving mathematical problems

Physics book:

Edge miracle: phase transition and critical phenomena, qualitative and semi-quantitative physics, introduction to solid state physics