Tried to piece this together myself from a downloaded copy of the old Wiki as well as Furukawa's Walkthrough, but this is understandably complex and (if possible) easy to mess up.
For instance, I believe last time I tried this, using the Book on Mrs Rack on a later lesson only for her to never play the scene where she reads it meaning I couldn't get it back from her or Tiff.

If it's possible, I'm trying to get every student, enslavable teacher, the NPCs, those routes where the teachers bring you more nameless slaves, Sarah's Mom, and the monster queen (whose scenario I still haven't been able to trigger anyway). And for the few who are capable of it, willingly (I think that's Val, Cassandra, and Molly?). And of course, a good ending.

How much of this is possible, or what's the closest I could get?

I get everyone all the time including the monster queen, but I never managed to get all the willing slaves simultaneously. I never tried to do all of the roots that get people to bring slaves to you, but I think it should be possible.

@Tylurn, how do i go for the monster ranch and monster queen routes? and can you try to make a walkthrough? and please if you can also send a link to the walkthrough but hosted in another place (blogspot or whatever was the name, makes me make an account and id rather not)