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.