The hardest crossword puzzle you have ever seen

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Across
  1. 3. what
  2. 5. battleroyale
  3. 7. science but for high school
  4. 9. a thing you sit on
  5. 10. The dude in our class
  6. 13. meow
  7. 17. Wonderful
  8. 18. the teacher
  9. 20. Evil
Down
  1. 1. lung
  2. 2. place
  3. 4. science but hard
  4. 6. bye
  5. 8. grammar
  6. 11. it goes meow
  7. 12. yo
  8. 14. yay
  9. 15. the make of the crassword puzzle best friend
  10. 16. the maker of this crossword puzzle
  11. 19. science