Lmfao. that's hilarious. And i like the "charge them to play" idea. be richer than any kid in the school by the end of the year you would.
Anyways, here's how my school system works. (I live in australia, btw, not that it's particularly relevant to anything.)
We have Prepatory, i think it's probably the equivalent to the US Kindergarten.
Then we have early years, where all the 1st, 2nd, 3rd and 4th years are supposed to be.
Next we have Middle years, with 5, 6 7 and 8 years are.
And then we have Later years. with year 9s, 10s and 11s and 12s. Conveniantly, only year 11 and 12s are seniors, so we can kick anyone out of an area whenever we want.
PLUS, to rub the salt in the wound after kicking them out, we bring a gamecube in and start playing Smash on our off-periods and Lunch. They get jealous and try and stop us from playing, not that they can.