This is my first submission.
There are some items that are changed.

Exit: Iron Door | Lever
Classroom Door: Oak Door
Swing Door: Birch Door
Walls: Stone Bricks
Notebooks: Book | Item Frame
Bsoda: Milk
Bsoda Machine: Dropper | Acacia Door | Button
Facaulty Door: Spruce Door
Locker: Chest | Jungle Trapdoor
Floor: Mushroom Stem
Ceiling: Diorite (plain and polished)
Miscellaneous Ceiling: White Terracotta
Lock: Barrier
Zesty Bar: Cookie
Tape: Music Disc 11
WD-NoSquee: Bucket

But there are things i could not fit in:
All the characters
Detention Room
Classroom w/Notebook 6
Zesty Bar Machine

PLEASE PLAY IN 1.13