
i want to be like those doctor that can play with knife that
kind leh. 
not use inner energy
Are you doing your "A"s or your "O"s now?
If you are truly interested in being a doctor, your "A"s must be
triple science and maths, and if possible, on H3 standard. Being a
doctor is no joke, it is VERY hard to enter medicine ( On the
otherhand, entering nursing is... ), so if you are taking "A"s
now with another combi, you can forget about it.
On the otherhand, if you are taking your "O"s now, even if you
do not have biology background now, there is one ( and only one )
JC which will allow you to take it up. That JC is YJC. But you will
have to work superhuman standard hard if you even want to
stand a chance of getting into medicine, when you do not have bio
as a subject now.