Aerian u better explore the syllabus and look at the past papers of the subjects . So that u better decide what is good for u . At this rate everyone suggesting different subjects u will be in a state of dilemma . Dont worry about scoring subjects , as it is upto u to boost up the score . thanks
Explore the following links.
http://www.cssforum.com.pk/css-syllabus.php
http://www.cssforum.com.pk/css-past-papers/