In my personal opinion, the last thing he would need is the help of a pyschiatrist. Some boys tend to be more aggressive. It is good he is in a smaller setting. Try to explain to him that hitting is not okay behavior. If he is disciplined by spanking, try to use another method. I am not saying spanking is bad, he may just be copying. Help him to remember to use his words. Remember, he needs to be trained to have appropriate behavior, he will not necessarily get it through osmosis. I have a 10 1/2 year old boy who is a busy boy. He would be good sometimes and not good other times. Until we realized we as the parents needed to work on some things, we were just going along hoping things would work out. It may sound silly to some, but we just didn't get it right away. He is our first and we are still learning. I can say, our son's behavior has improved dramatically since we made a conscious effort to "train" him.
I hope this is helpful.