Turn around a the blackboard, make a left at the water fountain and head through the doorframe. Angle left and move straight, keeping the table with the white tablecloth on your left side. Make a slight right and walk straight, waiting at the bottom of the stairwell.
Walk towards the water dispenser and exit the doorway to the left. Walk straight left of the white circular table and towards the wooden staircase.
Walk out of the bathroom, turn left, and wait at the bottom of the stairs.