Aslam o Alaikum,
Brothers Shah & Maneka Its simple demand and supply Rule that determines which subject is going to be high scoring & which is going to be low scoring in any particular year....
Given the type of trend (looking for short cuts to success) that exists in CSS, there is a strong tendency amongst the aspirants to choose so called High scoring subjects and no wonder you find most of them adoting those subjects which score high on that particular year.... Now when, say 80 out of 100, adopt a particular subject like sociology or Journalism, the competition automatically gets tough on that year and then presumably the commission discourage that trend in order to maintain level playing field (with of course human intervention)...
This rules doesn't apply on technical subjects like Geography because even though every one knows that it is scoring but even then only a few are able to opt this subject because of its technicality and requirement of typical aptitude.....
The bottom line: AT the end of the day you only have to contend with the bird in hand and not the one that is in the bush
