My son is only 2 so haven't had much experience with the exception of raising my little cousin who was Diagnosed with ADHD. He was on the track to going to Jail. My uncle sent him to live with me and my dad. My dad was a hard ass and he had to grow up quick or he would get smacked down. We took him off all the meds he was on and he straightened up. He didn't want to get in trouble at school or he would face the wrath of my dad. And it wasn't always physical punishment. But making him wash the car, vacuum it and do it over until it was right. Mow the yard no TV no Games. I still believe to this day he saved my cousins life.

One thing to think of if he is very smart like one other guy mentioned his child was. Is he might not be being challenged enough in school. Hes bored which in turn would make any one of us act up or go do something else.