Managing time is a learned skill. Some people may be naturally better than others, but everyone needs to learn and implement the practices to ensure success in not only the school setting but once they reach the workforce as well.
But how can parents help to teach and train teens (both younger and older) to be good time managers? After all, you teach them to brush their teeth, clean their rooms, and to be kind to others. It makes logical sense that they would need to be taught in this area as well. You may be an over-scheduler or a non-scheduler, but wherever you find yourself you can help instill healthy time management techniques into your children.