Back To School!

2. I'm a school supply related to one of the four gospels
7. the best class, at least in the opinion of the maker of this crossword puzzle
9. some types of me include construction and graph
10. the corridor of learning
11. the locale whence academics transpire
12. don't even try that eraser on me!
14. individualized classroom table
15. my name suggests I should be perched upon your thighs
17. mistakes will be made, but I can help
18. I sound like pool eyewear, but I'm even more useful to you
20. the class where you might study thermodynamics
21. people can do this to their hair or their reading materials

1. one who disseminates knowledge
3. these have replaced letters
4. don't wait till the last minute to solve this clue
5. I usually wear three rings on the inside
6. in math class, your homework questions usually come from this
8. one to whom wisdom is imparted
13. I have two pockets
16. use me without fear of permanence
19. the planet that grades you
22. my name suggests that you should be taking me to your domicile and laboring on me