iam agree with mano g . u should write down important points of concerned topic and maintain them regularly in a file. like pakistan and india relations, u should maintain uptodate knowledge from newspapers and other sources in notes form. only write important points. make notes and u can expand them in your own words.

i am further adding in advise that u should buy jahangir's world times magazine monthly which consists all national and international issues discussed by various scholars, columnists and csp officers. this will help u a lot in preparation of current affairs.