One to one online works well for a defined problem and poorly as a way of buying progress in general.
Good reasons to book it: a topic that has never made sense, a term missed through illness, examination technique in the last month, or a student whose gap is so far behind their grade that a live class would be uncomfortable.
A poor reason: a student who is not doing the work. An hour of individual attention does not create motivation and we will say so before taking the booking. Perhaps a third of the people who ask end up choosing a live class and the library instead, which costs a fifth as much.
Sessions are an hour on a shared writing board, recorded so the student keeps it, and the teacher sends a short written summary afterwards.
Two hundred and fifty rufiyaa an hour, or two thousand two hundred for ten. Nothing is payable in advance beyond the session you have booked.