We should all prepare for the possibility of a tornado by learning the safest places to seek shelter. This applies too more than just homes. Every school should have a plan as well. Develop a plan and have frequent drills. Each school should be inspected and tornado shelter areas designated by a registered engineer or architect.
Basements offer the best protection.
Schools without basements should use interior rooms and hallways on the lowest floor and away from windows. If the school's alarm system relies on electricity, have a compressed air horn or megaphone to activate the alarm in case of power failure. Make special provisions for disabled students and those in portable classrooms. Make sure someone knows how to turn off electricity and gas in the event the school is damaged. Keep children at school beyond regular hours if threatening weather is expected.