From the Classroom to the NFL

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Across
  1. 4. hold onto something
  2. 8. strengthen or increase
  3. 9. demanding strict attention
  4. 10. educational matters
  5. 12. someone who does well in studies and sports
Down
  1. 1. courses of action demanded by that force
  2. 2. engaged in a profession as a means of livelihood
  3. 3. someone's coach or guide
  4. 5. become part of a team
  5. 6. cut open or apart
  6. 7. self control
  7. 11. very useful or valuable