The written test includes professional knowledge and comprehensive knowledge. Professional knowledge is based on the college entrance examination outline, that is, a special math ability test. Comprehensive knowledge includes pedagogy, psychology, mathematics teaching method, class management, comprehensive common sense and so on, which is quite complicated.
I mainly read two parts of reference books during the exam. The first is the test paper simulation of college entrance examination mathematics. The second is two reference books specially written by Su Cheng for teachers. Now it seems to be published by Phoenix Publishing Group. You can go to them.