I'm looking for a story I once read about a high school student who has a little trouble learning. He has to study real hard to keep up. He also plays on the football team (defense, I think). Something happens and all of a sudden he starts having an easier time learning and then can learn thing really easily. He ends up asking to play offense and leans the playbook overnight.
That's about all I can remember about the story and I hope I'm not mixing up two different stories.