Its damn screwed up cuz you grow up as a kid and you don't really have a choice to your path in life fundamentally. Its up to how you're brought up. If you're taught/forced to be hardworking then you do fucking well in PSLE and go to 'up there' schools. Then most likely you won't know life in neighbourhood schools like how people tend to be more rebellious and daring and creative and prioritise a different set of things. Possibly cuz in some cases parents are the ones in power to make them study but yet they allow room for their child to disobey. Same for neighbourhood kids who don't really know the life of an 'up-there' student who usually doesn't get distracted especially when it comes to academics, but, as I see it, has more struggles keeping strong friendships.... Probably cuz they simply just don't see the need to have those.

PSLE grades then decide the secondary school you go to, meaning your schooling environment/friends you meet. Which decides your N/O level grades, Then it has effect on life in JC/Poly/ITE/Work/Stay at home waste life away/Enlist. And then working life.
And in the midst of all this, people jump around from neighbourhood to non-neighbourhood or vice versa. Which affects them in another set of ways. Heck, there's prolly more then just these 2 groups to categorise people into. (I just cant think of any more for now.) What I'm trying to say is that friendships are fragile to different groups of people and that you must know how much effort is needed to maintain it with different people.

Sounds like I've come up with a theory eh?