If he's on board with this, then I would send lunch to school with him. Turkey sandwich, grapes, fruits, pickles, carrots...
Kids like to pack a lunch, and school food is often high in sodium and fat.
Workout daily, even if your club isn't practicing. Maybe it's just 5 minutes on a treadmill. Eat evening meal early and be sensible. Be sensible as a family. Don't eat a double whopper with cheese in front of him. The day of weigh in, limit fluid intake, and dress warm.
If he's not on board with this, wrestle 73.
