How hyper is too hyper

That is what I was worried about. ADHD. He was drug exposed so I always have in the back of my mind that there may issues as he gets into school. I am not worried that he has any learning issues but he just seems so hyper. I am worried that the hyperness is going to cause issues in school. They have daily behavior grading and he has never gotten less than an excellent but I wonder if the teacher gives all the kids excellents everyday! I think I CAN ask him why he is never still. I hadn't thought of that.