The teacher's room

The one place you can think of that might lead to an exit is the teacher's room.

As you start walking to the teacher's room, with trepidation you open the door and as you make the first step inside you see there is a big TV on the wall to the left and a couple of black leather couches facility the monitors. To the right is a metal door with a lock and forward you see a big double door with round windows and green exit sign above it.

You quickly creep up to it and look through the window, a long corridor with doors left and right, and what looks like an elevator at the end.

You open the door, hastily walk up to the elevator but there find there is it needs a digital keycard, "maybe one of these doors lead to the card".

The first door to the left of the elevator is locked by the looks of it. The right door isn't, you take a big gulp, put your hand on the doorknob and open it.