What can I do about my son who is misbehaving at school?

you are not alone my step son was the same way he always had to be the center of attention, but he is adhd too.with him starting middle school there will be activities he is going to want to do sports he is going to want to play and they don't allow cl clowns in alot of these because the coaches will not tolerate disruptions, disrespect to others, you may need to sit down with him and find out what he has in mind for the school year to come and let him now the terms of participation in the areas.my son wanted to play football, and we in-rolled him it and not a week later he got suspended for horse playing around and hit someone in the head, so there is consequences to their actions as they move up in grades, and plus they just came out with the bully law ,let him know that if he hits someone the other child's parents can take charges out on him based on this new law, and it is not fun going in front of a judge at 11 or 12 years old because they make examples out of them and come down pretty hard on them, so just let him know that things change in a big way and his actions and out of the way comments could land him in juvenile detention and trust me he doesn't want that, and neither do you it's hard for both of you to deal with. good luck I hope that this will help in someway or another.