Choosing the school is not an easy task. You'll have to go there, meet with the staff, have a look on the school. But definetly, Cambridge is no good. Noor elKhaleej you will need to check the teachers and their accent as many of them are with the "W" as "V" and so.
Actualy most of the schools hire desperate houswives now-a-days, but at least they should know how to talk, pronounce and hopefully teach.