I had a friend who was a child psychologist employed by the Department of Education. His job was to visit schools and to try to help with kids who caused trouble.
First, he checked that the could see and hear okay and had normal intelligence and physical skills. Most did. He then tried to check on their home life. He claimed that this was where the problem was in the vast majority of cases. Problem kids were usually abused kids with problem parents. The abuse was mainly that of emotional neglect and was just as likely in well to do families as those of the less well off. Buying kids expensive toys did not compensate for waring parents, not reading them bedtime stories, not eating meals together, not going to the beach as a family, etc.