you may want to seek psychological help. i know you said your brother tried this before and didn't work, but maybe it wasn't the right therapist for him. is it fundamental that you find someone who your brother can trust and open up with. you also mentioned that he stopped all of his activities before he became a gaming addict, so maybe there's an underling condition of depression and the gaming addiction is only a symptom. it should be worth to try to bring the entire family in treatment because it seems to me that your parents aren't fulfilling their role as authority figures. your whole family mechanics need to be rethought and reworked.
in the meanwhile you shouldn't allow him to ignore school anymore, he's still in time, but if he continues any longer he will endanger his own future.
sorry for the bad english, but it's not my native language
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