“Examination Day” by Henry Slesar
Full text: https://www.gulfportschools.org/cms/lib07/MS01910520/Centricity/Domain/1228/examination_day_by_henry_slesar.pdf
I read this when I was about 12.
I remember this story. Been looking for it for years. Thank you so much!
https://www.youtube.com/watch?v=ID21xdtESV4