if you refer a level like in school or high school could be, I am allowed to teach tenth or more, but if you say 10 or over is like a time like 10 years or more got it?

I would say I am allowed to teach term 10 and higher?

I am allowed to teach grade 10 and above. I am allowed to teach grade 10 and higher. I am certified to teach grade 10 above.

"More" would refer to quantity, and "over" would refer to level, so for "term" or "grade," "over" would be better. Also acceptable in most cases: "up." I am allowed to teach term 10 and up.

heey??