My secondary/high school had 300-400 kids per year, about 1500 over the 4 years it covered. Though my previous two schools to that were much smaller, I think it

My secondary/high school had 300-400 kids per year, about 1500 over the 4 years it covered. Though my previous two schools to that were much smaller, I think it's generally common here for junior schools to be smaller than senior schools. And I think you're right, smaller schools probably have less of a chance of large distinct social groups forming. Perhaps there is a tipping point though, where these groups form, I certainly didn't experience such well defined and distinct groups as these kinds of stories portray. The other difference I suppose was school uniform, though I feel like that's unlikely to have made a significant difference.