any exercise or method to achieve dat ? i noe there's alot of movies on youtube but i juz duno which to choose n to be frank, some of them are juz craps...any advice for me ?

well i duno exercise or what. but i believe that by pushing yourself to the limits (upper / lower) of your voice range, slowly but surely you will increase your voice range.

there is no specific exercise to increase the vocal range.
u just have to keep pushing higher n higher.

pushing myself to the limits = try best to achieve higher notes no matter what ?

i guess so. because our bodies can respond very well to these kinda things. our voice box has much more potential than we usually use it for.

for example - a song meant to be sung in the key of G, u slow sing it in A. then get all the weak notes right. once everything is comfortable, then raise the key again n again.

i think that would help.

bubbling helps i think..

Whatever you intend to do, plz ALWAYS warm up and warm down.

bubbling means ?

maybe practise on the breathing 1st..

swimming

or even jogging