As requested by fellow students of HIMALAI Bangalore ,
These are the must read books for a civil service candidate who is appearing for Preliminary Test - CSAT 1 .
1) History - NCERT History XII class (if time permits spectrum publication's Modern History)
2) Geography - NCERT Geography class XI ,XII (4 books)
3) Economics - NCERT XI ,XII (Macroeconomics book), Budget's speech of that year (If time permits Important chapters of Economic survey)
4) Polity - NCERT XI Indian Constitution and Indian Polity by Laxmikanth
5) Current Affairs - Oct to May 201X HINDU newspaper , supplemented by magazines(chronicle, wizard) of these months. Reading newspaper is like reading a book. You shouldn't forget a minute detail also.
6) India Year Book 2012 (chapters which coincide with syllabus of Paper I) Indian Year book hardly changes in content, so u can refer 2012 book for 2013 also.
7) Social sector initiatives from govt of india websites.
Item (6) and (7) are not mandatory , but might fetch you that additional edge.