one advice for u, Advanz is to consider other options other than stpm.
i am not trying to discourage u but studying in f6 needs a lot of hardwork and commitment especially in science stream.
unless u study in arts stream then u got a bit more free time.
in f6 u really need to give 110%, if not u are just wasting 2 years of ur precious time.

do u have any other things in mind? any hobby or secial interest?
u can always enrol into vocational study like fix handphone, baking, etc..

yeah worse come to worse is that u need to take the lousy pengajian am which have no meaning watsoever. but u need to pass that paper in order to get a cert.