Many valedictorians found their friends in elective classes or religious groups. Encourage diverse friendships. Host alcohol-free parties. Create opportunities for your child to have fun alone so he can look at the peer culture scene and decide whether to take it or leave it. Make homework an integral part of the daily routine.
Valedictorians are highly organized.
They know how to summarize their notes and prepare for tests. When a topic interests them, they follow up independently. Whether or not they should do their work isn't a daily decision. It would be a major decision not to do it. Show a deep respect for the homework routine.