In music you usually have a small amount of one-on-one instruction and then you practice. In tennis you usually have a small number of one-one-lessons and then you practice and play matches.
You could probably do the same for maths. You're given some problems to try to solve and given two hours, then once you've made a serious attempt you get individual tutoring for an hour, then you go back to solving problems and there's a short one-on-one question session at the end, let's say 30 minutes. Then you have a 5 hour study session with 1.5 hours of teacher time, so he can have around three students.
In music you usually have a small amount of one-on-one instruction and then you practice. In tennis you usually have a small number of one-one-lessons and then you practice and play matches.
You could probably do the same for maths. You're given some problems to try to solve and given two hours, then once you've made a serious attempt you get individual tutoring for an hour, then you go back to solving problems and there's a short one-on-one question session at the end, let's say 30 minutes. Then you have a 5 hour study session with 1.5 hours of teacher time, so he can have around three students.