Some schools don't allow their teachers to provide tutoring outside of school hours. Check with other teachers at the school (if you know any) to see what the policy and enforcement issues are.

See more info here:
http://thepeninsulaqatar.com/news/qatar/195703/efforts-by-govt-schools-f...
http://thepeninsulaqatar.com/news/qatar/241339/stricter-rules-in-offing-...