First of all, you must have a senior middle school teacher qualification certificate (of course, there are very few schools that do not require it, but you are required to get the certificate within one year after you join the job. Teachers' qualification certificate must be at least two grades of psychology, pedagogy and Mandarin, and chalk, brush and pen are also required to be qualified for regular normal classes)
Secondly, it is your major. At present, the general requirements for taking the senior high school mathematics teacher major are graduates of mathematics, applied mathematics and other mathematics majors, or graduates of basic mathematics, applied mathematics, computational mathematics and other mathematics majors.
Finally, I personally think that teachers are a great profession, and they should have a basic morality and demeanor, be a model and learn to be a model!