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god i had the same problem with barnaby's fail end CG...i failed more than 5 times to get it before giving up lmao, but i found a comment below me with the steps that helped me get it if you haven't seen it yet. hope this helps :)
(credit to @/Nokayo)

1st meeting (class):

"hi" & "comment on how interesting the play is"

2nd meeting (class):

"compliment barnaby's notes"

3rd meeting (6:00 PM library, work on class project with barnaby)

"disagree"

4th meeting: (6:00 PM library, work on class project with barnaby)

"go to the door"

he still avoids you if you try to approach him in class after this, but it should give you the CG you're looking for

for Arbor's route

1st meeting
"did you draw those?"

2nd meeting
"looks like you really enjoy this"

and then try to go to the afterlife by dying.
you can eat the mushrooms in the forest, it's the quickest way to die.
I think you only need to eat it 2 times tho.

but after death, there's an option where you pick to just die or still live(as a ghost), if you pick the live as a ghost one. You'll continue to Arbor's route.

Also it may be better if you save at this point, where you pick to pass on or still live(as a ghost ofc)). If you don't want to redo her route all over again(if you choose to pass on by accident) 

this may be somewhat incorrect but this is what I remember from playing in her route.