When I was at secondary school, we had six forms across the year.
Three of the classes were "naughty" - they were one half of the year and had assemblies, etc together.
The other three classes were "good" and also had assemblies together, etc.
The class I was in was "the best" - we won everything, all the sports days, all the class events, everything - we pulled together brilliantly and even the lads who might've been troublesome and the girls who were more fussed about their hair and not much else couldn't say no to the others who rallied them and involved them and just plain expected them to join in.
The teachers recognised this and when we got to the fourth year, they put the other two "good" classes with the worst of the bad ones and we were put with the other two more dubious classes.
Worked quite well too.
[sweet 'n' sour cucumber]