Many mathematics majors want to be teachers, so if you have the idea of being a teacher, you can consider taking an examination of normal colleges, because most of them want to be teachers, so the key to mathematics is how to graduate easily. Because mathematics majors are not easy to make a sound, graduation is a problem, especially in good schools, so you should choose some interdisciplinary directions, because it is relatively novel, so it is easy to send papers and graduate.

If they are interdisciplinary, many of them are interdisciplinary in computer, automation and other majors, because these majors need good mathematical knowledge.

Schools with good mathematics include Nankai University, Fudan University, Nanjing University, Capital Normal University and so on.

Of course, Shandong University is also very good.

Finally, I wish you happiness.