depends ur school de actually
some does offer bio and physic
mostly offer either bio or physic
cos if offer both then the time schedule is very packed and needs to be extended
and it's not a good bet as taking both subjects will make ur life very stressed

ya .. it's not neccessary ..

btw if ur school don allow you take both physic and bio ..
then the only way is to study one on your own then ..
which is a risky move ..
i got 1 fren (she got 4.00 in STPM btw)
she once take both physic n bio ..
although i and herself think she can get A for both in the 2nd semester she giv up physic to concentrate on bio instead
ain't worth the risk she said

no .. they can't stop you from taking more subjects ..
just that they aren't gonna teach you tat subjects and you have to cope with it your own ..
either you self study or tuition outside

they don't have the mean to stop you from taking more subjects ..

no particular rule say need to study wat subject de ah for law ..
long as u get ~4.00 CGPA