Dear aspirant,
I would prefer you to start from N.C.E.R.T go thoroughly from the ncerts of 6th to 12th standard of history, civics or polity, geography, economics and disaster management. Also go through ncerts of science and technology but for this only from class 8th to 12th. You might not go deep in class’s 11th nd 12th for science. Also if you are planning to take sociology or psychology as your subject then have through reading of these two subject's ncert also. If you are planning to go for coaching make sure you have read all these ncerts at least twice religiously. Make it a habit of reading a newspaper daily The HINDU preferable and INDIAN EXPRESS' Sunday edition. I would also prefer some magazines such as India Today, Frontline, Kurukshetra and Yojana. Studying all these will at least help you cover 40% of the prelims syllabus and for further detailed books of each subject after the ncerts you can contact me back.
Hope this helps.
Good luck
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