What do you call grinds in Chinese? I'm not sure if this word exists in the states or even in the UK but in Ireland we call extra tuition outside of school grinds. I give maths and physics grinds to a number of students.
I am aware of the term 家教 but it just doesn't feel right in the context that I want to use it.
How would I say for example :

I give maths grinds to 3 students.

I offered free grinds to my students.

Giving grinds is good money.


Thank you all.
If grinds mean tutoring/ tuition in this context, we can just simply translate grinds as 补习.
If you need to specific, you can say 校外补习  (outside school tutoring) or 私人补习  (private tutoring)

I give maths grinds to 3 students. - 我给3名学生做数学补习。


I offered free grinds to my students. - 我向学生提供免费补习。


Giving grinds is good money. - 给人补习的收入不错

Usually, 给人补习 (give tuition) is a job for 家庭教师 (private teacher), but anyone qualified can offer tuition to anyone who needs it.