As your teens continue to grow up, they continue to need you to tell them what you expect of them. For example, insist they take responsibility for their learning in the school year to come. Then, to help them live up to their commitments, offer them calendars, organization tips and other tools they can use to manage their work. Also, review the school's code of conduct with your teens and let them know you expect them to follow it.
Source: The Parent Institute