make sure you close all the doors after you leave a room
See "F" below

leave doors open was incorrect on this one. credit goes to Marklar
"I believe the A+ and F ending conditions are different tho.
For F ending you have to finish without reading the notes, and for A+ ending you have to read every note. Also you must read all the notes before picking up the exams. I left all doors open and got the good ending by reading all notes.
Here's a list where notes are:
Teachers room 1st floor, 1-3,1-1, Teachers room 2nd floor, 2-3,2-2, Teachers room 3rd floor, 3-2, 3-1, Teachers room 4th floor, 4-2, 4-1."

get both endings

make sure you read every note book

interact with 30 elements

(The fastest way to get this is to intereact with your friends until they repeat themselves at the start and at the school gates, every vending machine, every mailbox, and as many items on the table as you can.)

Find the secret room

3rd floor locked door that cannot be opened with a key, that has this poster next to it.
spam it till the "door is locked" message pops up a few times and it should open.

collect all the school badges.



make sure you check the beginning of the game!!

#1

go to the very left street and folow all the way until you get to this dark area (behind them)

it will be in the right corner


#2

go down the middle street and look for this little alley way. go down it until you get to the vending machines

it will be next to the trash can on the left side of the vending machines


#3 the school grounds

go west all the way till you are near the corner with the manhole. on the right of the trashcan near the doors it will be on the ground

#4

it will be in the classroom right after class 1-3 in one of the corners


#5

it will be on the second floor next to the locker on the outside of the classes directly behind the second door of class 2-3 (depending on which way you came it could be the first door)


#6

in class 3-3 next to the teachers podium

#7

in class 3-2 in the corner

#8

The Last One
in class 4-3 on top of the shelves here!

Hope this helps (sorry for the ♥♥♥♥♥♥ formatting!)