It seems to me that a balanced essay is asking that you give both sides instead of choosing one side. If that’s the case, you need to explore why they should go to different schools and also why they should not go to different schools. But without knowing exactly what the teacher is wanting, there is no way to help you. Also, this is asking for your final draft. Have you written your rough draft yet? If so, include it and I would happily edit it and critique it.