A tweet: “I feel bad for teachers because I distinctly remember my mom bursting into tears once when she was grading papers and she was just mumbling ‘they’re so goddamn stupid’ over and over.”
Personal experience: My wife was helping me grade tests from a college freshman class. She said, “This is disgusting. They’re not trying.” She suggested: “I would have all the A students sit at the front and tell the others to move their desks to the back of the room and keep their mouths shut.”
Just so you know I'm not making up the tweet.