Well,as it was my last attempt so i observed drastic changes in paper patterns and area of interests of papers setters.For me ,CSS has remained a mystery as you cannot predict about what examiner is going to ask e.g.in recent exams we all were expecting Arab Spring would be asked in current affairs paper but examiner went other way.Even u cannot speculate ur marks.With all other approaches,according to my own opinion,ur understanding and ability to analyze topic critically do matter more.Gud luck for those appeared first time.And more gud luck for those who r in second....and last bus...