The emphasis of each specialized course is different, even in the same area, it is different every year.
First, study the explanation of specialized courses in the announcement of teacher recruitment, and see whether it is mainly high school or university. It is best to specify reference books, but usually not.
Second, I personally feel that there are the following common knowledge points.
1. Basic computer knowledge, especially von Neumann's thought and the conversion from decimal to binary and hexadecimal.
2. The network part, especially the contents related to TCP/IP protocol and LAN.
3. Programming problem, which is different from civil servants. Generally, no programming language is specified. You can write code in a language you are familiar with.
Basic operation of 4.4. WORD, EXCEL and POWERPOINT.
Thirdly, it is difficult to find the relevant review materials of the teacher recruitment examination, especially the specialized courses. You can refer to some review materials of computer major in civil service examination, such as simulation papers. Personally, I think some topics are still relatively close.
I hope my answer can help you and wish you good grades.