| http://www.w3.org/ns/prov#value | - Sir, I am appearing in ias 2014 and my optional is history sir, problem is that I have seen history optional paper 2013 and I found that 20 % questions are such type that I am unable to find their answers from many books such as ncerts, Romila Thopper, Ignou notes, coaching notes and others, Sir how to cover such types of questions?
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