Is the payment of the remaining amount (2000 Riyals) to the private tutor obligatory, and is that considered a debt upon the student, knowing that the tutor attended a small number of sessions and wishes for one revision session?

If both parties agree on teaching the entire curriculum for a specific amount, then it is a binding租赁 contract for both parties. The teacher is entitled to the full wage if he completes the explanation of the curriculum in the usual manner, regardless of the number of sessions, because the contract was for the curriculum. However, if the work is not completed as required, the hirer has the right to terminate the contract, and the teacher is only entitled to the wage for the work he has performed. It is recommended that private lessons for women be with a female teacher to avoid temptation.