Seeing your problem in Weibo, I have some suggestions. First of all, you are an English teacher at present, so your major should be English. As far as I know, there is still a big difference between language majors and science and engineering. Even though the mathematics of primary school students is relatively simple now, I have seen some Olympic math problems that are still very difficult. Are you sure you want to teach a brand-new subject? You know, other math teachers are trained.

Secondly, if you choose to make such a big change in order to escape from the existing environment, then I can tell you that under the current education system, almost all schools in China are the same (of course, the teaching in universities will be slightly better, after all, the academic atmosphere is heavier, but even if you change units in an environment like primary school, it is basically a new model).

Third, the work of a head teacher is a laborious job, especially if you are still a primary school head teacher. The head teacher is responsible for the children's courses, safety, coordination with teachers and communication with parents, unless you make such preparations.

The above three points are for reference only. I am a college professional teacher and also a class teacher. Ten years ago, when I was an undergraduate, I had dealings with primary school students. I know it's not easy to be a primary school teacher. I hope you will consider changing careers from your major and hobbies. Interlaced scanning is very important in professional teaching.