I lifted this one from The Historian a/k/a Yukiyama.
Which high school produced the most NCAA champions in a single year ?
The answer is incredible.
"In 1942, seven of the 16 finalists were teammates at Tulsa Central High School. The Jennings twins and Bill Maxwell of Michigan State won titles, as did David Arndt and Vern Logan of Oklahoma State."
National Wrestling Hall of Fame and Museum
Now you may think that most of the good ones left school because of the war. Keep in mind this tournament was 3 months post Dec 7 '41. Most were in the middle of their season and had not yet enlisted.