[quote]could he argue that I am taking him away from his social circle, which in my opinion is what is causing the problems in the first place. [/quote]
That's not an argument that is going to hold up in court. Let him use that argument. Let your son's school record show why he needs to be in a better school district.
Has your son gotten into trouble with the law? His friends? If yes to both questions, use that in court.