its upto you Dear...because every one has its own aptitude regarding subjects. even i did LLM but didnt opt Mercantile Law and Constitutional Law. Here in CSS forum there are only 5 to 7 subjects which every one is suggesting to opt but we must consider our aptitude regardless of their scoring trend even it matters a lot. e.g indo-pak history is considered as a crap for its scoring trend but there are some students who obtained more than 140. just go through the syllabus and past papers of every subject then after a little effort you ll be able to opt the best for you.