What's inside a sixth grader's brain

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Across
  1. 5. "Most Wonderful Time Of the Year"
  2. 8. playing soccer with RC cars
  3. 10. youtube channel ruining your childhood since 2011
  4. 12. your math teacher
  5. 14. the best science teacher
  6. 16. creature who makes presents for the jolly old fat man
  7. 17. from Mary Poppins
  8. 19. flies the sleigh; has facial hair
  9. 21. Burger rapper
Down
  1. 1. full of boxes; has dungeons
  2. 2. a long time ago in a galaxy far far away
  3. 3. shiny armor and has a green son/pet
  4. 4. the 12th month of the year
  5. 6. comes once a year; day you were born
  6. 7. Santa likes these as a snack
  7. 9. super nice and smart
  8. 11. you get them on holidays like your birthday
  9. 13. flying creature; some of them bullied the red-nosed one
  10. 15. mythical horse (ice cream cone)
  11. 17. where you learn; could be a building
  12. 18. very popular game that we can't agree on
  13. 20. imposter or crewmate?