School would probably be Liable and sued when the kid turns 18 unless. They can show that it was someone elses medical opinion to go along with this. Such as official letters from one or more Licenced Psychiatrists that this was necessary/ in the best interest of the child.
If it’s just because the kid wants to. The School system being “Professionals” might be cited for not protecting the kid from the trauma that will come from his choice.
How convenient..... long term planning.