Are there any restrictions on undergraduate majors? Please check the notes on the professional catalogue published by the school. As long as there is no restriction on the professional catalogue, you can apply for it. In addition, some colleges and universities restrict the undergraduate majors of candidates, resulting in many students unable to sign up for the exam.
It is recommended to choose the school to apply for, and then check the professional catalogue published by the school to see if there are any restrictions on undergraduate majors.
If you want to do research, get a doctorate and be a teacher, I suggest you apply for a master's degree, because the master's degree focuses on theory and research. The research of mathematics education in primary and secondary schools is mainly to study the teaching methods of mathematics education and train middle school teachers and teaching and research staff in teaching and research offices around the country.
The difficulty of examination focuses on the difficulty of cross-examination. Because the significant difference between mathematics and other disciplines lies in its strong professionalism, especially the content of the second major examination, it is difficult to get started if the mathematics department studies for a long time in the future.