Mikie
First, you get out of your desk and run to any desk that has a heart below it.
Stand beside the person on the chair and press return to bump them off. Now sit
down in the chair, and the heart will fly up to the top of the screen. Do
this for all the hearts, and the word OPEN! will be spelt. You can then run
to the exit door, and press return to open it.

Sitting in the desks is a bit fiddly, but you can stay there for a short
time if the teacher is too close (he will eventually run back to the top
right corner).

Once you have left the classroom, you have to avoid the janator and the
teacher in the hall. This is as far as I've got - I think you have to run
to the right though.