I started this a couple weeks before school ended. I found it again yesterday when I was rummaging through my binder, looking for a gluestick so I could make Odelay, so I finished it!
Start at the filled-in triangle, and finish at the crosshatched triangle on the back.
You can go through the doors and come out the other door of the same number on the other side of the paper:
The paths that lead to the doors are shaded in. You can't just enter from any path that bumps up against the side of the door!
Those light blue circles are where the binder-ring hole thingies are.
If you can complete this, you deserve a cookie.