There are a lot of good wrestler diets on the internet - just make sure it is coming from a source you can trust. (google "wrestlers diet").
I can tell you first hand what we do at our house when they are cutting weight....
For breakfast, my sons eat low-fat cereal/skim milk with a banana or orange juice to drink.
For lunch, they eat Healthy choice soup: vegetable, chicken noodle or stew. They also eat as much salad as they want with NO DRESSING.
For supper, they have grilled chicken the size of their hand with steamed vegetables. Other days, they have two boiled eggs on toasted bread (no butter) or a turkey whole-wheat sandwich with lettuce.
I also push that they take along graham crackers and those really small boxes of raisins to school and keep it in their locker. In between classes, they grab a square or a box of raisins and eat it. Before practice, they eat two squares of graham crackers and have a banana, apple or other piece of fruit. By eating throughout the day - they don't feel like they are as hungry and it keeps their metabolism up.
And then the most important thing is to RUN and RUN and RUN.
