There are more than 900 questions in it, each of which is carefully selected or adapted by Mr. Yang Chao, and it can be said that it is a sharp weapon to practice calculation ability.

Yang Chao, a famous math teacher [1-2], doctor of economics, postdoctoral fellow of California State University, visiting scholar of Stanford University. Engaged in mathematics teaching for postgraduate entrance examination for many years, combining philosophical logic with mathematical logic, forming exclusive problem-solving ideas and original oral calculation formulas, and putting forward the review concept of repeatedly training "three major calculations" in the basic stage.