a lot of ECs, this is very typic for good private school,

big Public HS(>1000/class) and magnet schools for gifted. Because schools have more resources and their students know how to do those things. The kids in those school show more agreesive. For small public school, no such resouces and all those are parent's job. Student in small school is more relax and happy and they also get into decent university. But this will change when kids get accepted into a big good university. this is real competion start.