Pupils are put into teams of 12 (with larger groups reserves maybe used). Play a full game incorporating :-
6 vs 6 Scrums.
6 vs 6 line outs.
Drop kick restarts (or punt if skill level requires).
Full tackling.
Go forward
Run at space not at people.
Communicate.
Pass before contact.
Look after the ball in contact.
Use a wide are to encourage lots of tries.
World Rugby has reportedly conceded Aaron Smith's disallowed try in the World Cup final should have stood.
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.