as a former school student in scotland i just downloaded tor from a mirror site as the school forgot to remove it and used one of the bridges (can’t remember the exact one i used) which allowed me to access youtube and other blocked sites
is my school the only school what uses a network-side filter
everyone’s seems to use a browser extension (easily bypassed)
EDIT: in fact, it’s definitely all schools in aberdeenshire, and likely all in scotland