Great advice in this thread. I'm wondering if the school could/should provide a teacher's aide, at least for part of the day a few times a week. Are there certain triggers that cause problems (e.g. a particular subject, being tired in the afternoons, stuff like that)? As an adult with ADHD, I promise you kids with ADHD aren't naughty on purpose, there's stuff going on so if those things can be identified and dealt with, you should see an improvement in his behaviour. Good luck!