4 complete-ish sets of Japanese resources (that I haven't actually proofread or listened to):

- Try! Japanese Language Proficiency Test (N1 textbook is in JP/CN)
- Nihongo So-Matome - Seemingly complete set from weeblibrary
- Minna No Nihongo - Complete Beginner and Advanced set from Anna's Archive
- Dictionaries of Basic and Advanced Japanese Grammar - self-explanatory, from AA


Other resources that could be interesting:
- Shin Kanzen Master series - Couldn't find a complete set of their N4 books,
  so I didn't include it. More advanced sets seem to be complete in the url below:
  	https://weeblibrary.wordpress.com/shin-kanzen-master/
  (I recommend the FastForward extension for their url shorteners)
  	https://github.com/FastForwardTeam/FastForward/blob/main/INSTALLING.md
  (I couldn't be arsed to rename another 10000 files)

- JLPT Official Books - I'm sure they're out there somewhere, but I can't 
  find them all in one centralized place. 

Sources used:
- https://duckduckgo.com
- https://old.reddit.com
- https://annas-archive.org
- https://weeblibrary.wordpress.com
- lots of clickbait friendly articles