Back To School!

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