The reward function was horrible!
You need good sightlines for the kids, room for desks, and need to ensure kids aren't isolated in a corner. Plus light (not just to a small courtyard), ability to escape in case of fire or other emergency!!!!!!! and for minimal noise intrusion from other classrooms.
Minimal space and building material are just not the right constraints and speak to absolute ignorance of the actual problem on the part of the designer.