There was this kid in my school when I was little. He was constantly getting into fights, always looking to start trouble. I don't think he was a bad guy either, he just didn't think things through, like never. Even bullies were careful around this guy and rightfully so, you could never be relaxed around him cause he could change his mind about you in a second and acted on impulse. I think they later diagnosed him with ADHT.
School didn't go too well for this guy, and later in life he got connected with bad people, so be extra careful for your kid.
I think my son has not have an ADHT, I think it is different to ASD and ADHD because my son is very sweet and loving. There are also some ways that I notice him that he doesn't talk to us a lot but he just want to sing and use to tell everything what he hears on TV and when he memorize the song or on what says on TV he keep telling it again and again. I already got him to the doctor and she said he need an attention and he needs a therapy which is Speech/Language Therapy and Occupational Therapy.