Format was two lines of boys doubles, two lines of girls doubles, and one line of mixed doubles (line 5). Students are 7th and 8th graders.
There are two squads or divisions who play for each school, A and B, with A squad being the more skilled/experienced, at least in theory.
Like many rec leagues players are self-rated and there are no miminum skill requirements or limits apparently. Some kids in my son's B group could barely hit the ball last week in practice while a couple clearly had extensive training. Most were like my son who obviously had lots of court time, good forehands, weak but consistent serves, weak backhands, and virtually no net game.
The casual hitting between my son, his partner, and mini-Nadal of course didn't count and was just an attempt by the boys to get some practice time.