Hey shruti!
That's a pretty vauge question if you ask me , it all depends upto you and your depth of knowledge that you posses , what I am trying to make you understand is suppose you are good in elementary maths then by merely solving few previous year papers would suffice otherwise you would to know a little but about the concepts being used , apply it and understand. I suggest you start with buying a reference book , and work your way accordingly , a book which I currently am using is AFCAT previous year question paper by disha publication . For general knowledge is better that you follow competition succes or any other kind of weekly and your static can be covered by social science NCERT.
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