Yup, they ask at bar/bas mitzva age. I believe it’s a whole ritual in beis din. I know someone who went through that too.
And forget about kicking out of schools, how about the kids who don’t even get in to school because the hanhala believes it’s pointless cuz anyways s/he will be kicked out in a few weeks??? Oh, so they’re giving off the message that the streets are a better place for people like you. Much better.