Schools have hallways and they have classrooms.
Classrooms are like any room with walls and floors, ceilings and windows, doors, smells, sounds, and textures. Classrooms also have chalkboards, computers, chairs, tables, desks, and the teachers area. They have bookshelves and heating vents. Once you know one classroom, all the rest are just slight variations on the main spatial theme. The same is true of hallways.