Junior high school mathematics must have a good foundation. Especially plane geometry and algebra, will help students understand the problems they encounter, and they can't have a little knowledge. Some college students are liberal arts majors, but they didn't do well in mathematics in the senior high school entrance examination, so they are not suitable for being junior high school mathematics tutors.
Good language skills. Tutors need to communicate with students. I am a fool, even if other students don't want to be near you, you will have no "fate" with them, and one day it will end in discord.
Have affinity. You should make children like you. Children like talented teachers, and there are more teachers who speak the same language as themselves, so they should be good at everything except math. For example, one day a student accidentally asks you how to write a composition, and you make him suddenly enlightened and he will admire you very much.