One is the teacher who teaches foreign languages and other so-called main courses. These teachers are recognized as front-line teachers and have class fees. The courses taught are all subjects to be tested in the entrance examination. Specifically, Chinese, mathematics, foreign languages, physics and chemistry can also be called main subjects, because history, geography and biology should be included in the comprehensive examination.

The second is a teacher who teaches so-called minor courses such as computer, general technology and various elective courses. Because these teachers teach students directly, in the school's salary system, the class fee is also calculated according to the teaching time, and they are also front-line teachers. The courses taught are generally not tested in the entrance examination, but they should be consulted in the teaching task. Specifically, there are computers (also called information technology), general technology (also called labor technology), courses offered separately by schools, and various elective courses. Because physical education is not a cultural course, it used to be classified as a minor course, and now physical education accounts for a score in the entrance examination, so many people also classify physical education as a main course.