@ dr. taqqi abbas

dr sahab if u have dat xtra-ordinary skill for political sciences.... go for it . u know these general formulae that one subject is low scoring and other is high scorin and so on are general presumptions...for general crowd....
And for exceptions .... exclusive formulae are formed.
and css is sumfin where u have to take both ur brain and heart wid u in order to bring out the full sparks.

so in this backdrop i wud suggest u to stick to political sciences.

plus for agriculture and journalism u have to study 4 tymes more than this. as each subject no matter ov 100 marks or 200 mrks.... requires equal amount ov energy and indepth study.. so in ma humble opinion u shud stick to pol sciences..... and u shud go for sumfin for which u possess xtra ordinary spark!

wishin u best ov luck.

btw i jus remebered one thing more..

the most popular combinations are

british history/indo-pak (but indo-pak is given v low scores now)
journalism
sociology
arabic/geography

hope i have been ov some help
best ov luck