Back To School!

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Across
  1. 2. these have replaced letters
  2. 6. in math class, your homework questions usually come from this
  3. 8. the locale whence academics transpire
  4. 9. the best class, at least in the opinion of the maker of this crossword puzzle
  5. 10. don't wait till the last minute to solve this clue
  6. 12. individualized classroom table
  7. 14. one who disseminates knowledge
  8. 16. I sound like pool eyewear, but I'm even more useful to you
  9. 17. the planet that grades you
  10. 18. mistakes will be made, but I can help
  11. 20. don't even try that eraser on me!
Down
  1. 1. I have two pockets
  2. 3. my name suggests I should be perched upon your thighs
  3. 4. I'm a school supply related to one of the four gospels
  4. 5. some types of me include construction and graph
  5. 7. I usually wear three rings on the inside
  6. 11. the corridor of learning
  7. 13. use me without fear of permanence
  8. 15. my name suggests that you should be taking me to your domicile and laboring on me
  9. 19. one to whom wisdom is imparted