My 12 you DS, year 8, is I guess becoming typical teenager. He has regular detentions for arguing during lessons, few fights, school has no touch policy, so detentions are easy to get. Nothing major. But recently he has constantly long face, lies, argues at school more, talks back to teachers, today another student slapped the back of his head, so he hit back. Angry teacher left a voice mail. How do I discipline 12yo??? Taking privileges away doesn't work...