Dear let me clear your ambiguity, I appeared with PS as an optional in CSS-15 and for 16 attempt like others I start with IR but the wide syllabus and critical approach was barrier for me. Being an engineer I'm not that critical analyst, so i left IR and start preparing economics. Consider this attempt without any GURU prediction and set aside the concept of scoring and non-scoring subject. Oh, I forgot to tell you why I left PS, well it was very boring.