aiyah, i always hate act-cool people. but seriously, from my wisdom and experience, in all i've seen in life, only got 2 types of act-act people: Guys who act cool and girls who act cute.
in general, guys seldom act cute unless it's those very very gay and soft types, but i have only seen 1 case so far. girls, even those in their 20s+, all love to act cute. i don't remember seeing girls who act cool(although a girl who acts cool is truly cool!

)
some tips, by the way:
1) don't get invovled in un-necessary trouble, meaning that don't join as CCAs if you can help it; waste of time, considering SG's local talent. better to use the time to go library, surf porn, play xBox 360 games or go shop for nice-nice clothes.
2) be neutral to the gangsters; if you are walking along a narrow vertical pathway in school and they're walking towards you and if they're part of your class, say hello to them so they don't feel alienated/offended.
3) don't act cool if you're a guy; will offend the gangsters. last time in 1998 when i was in sec 2, got one indonesian-chinese guy quite rich and handsome. always walk like a cool penguin with the legs motion thrusting left and right, shouder up and down, instead of thrusting the legs forward as we usually do. in the end, some gangsters drag him to empty classroom and punch his stomach because they bua-song his "dao" attitude. ya-ya lah! KNN! serves him right. i missed the show, though.
if you're a girl, don't act cute. will offend female gangsters and they're really bitchy about it. first, they'll constantly talk about you behind your back when they see you, then it comes to confrontation and assaulting you with barbie doll's leg. KNN. if you're pretty, then you must act humble and kind. if you're plain, act really kind and sweet.
from my experience, unlike male gangsters, female gangsters won't pick on those guai-guai little girls one.
if got female gangsters bully you, pay S$30 per banglah and ask them to take the female gangsters to male toilet and settle there. ARK HA HA HA!

i think the guys here in sgforums also quite willing to help out for free, although i'm not interested.
that's all,
nikar.