This is part of an series of locations for Halloween (2018). For the main page, go here.
The classroom scene was located at the Danny Jones Complex Armory at 5000 Lackawanna Boulevard in North Charleston, South Carolina.
The production built a false wall to make the room smaller and added blinds.
Her POV shot is actually looking out the other side of the building towards Exchange Park.
It appears for the school hallway, we are back at the Military Magnet Academy. I wasn’t able to take interior pictures during my visit, but here is a shot I found which appears to match up to the shot used in the film.