R S Agarwal books for aptitude, reasoning and english.
History by Bipan Chandra or Romila thappar
Indian Polity by LaxmiKanth
Geography by Majid Hussain and Spectrum
Economics by Dutt and Sundaram.
And NCERT Books 10th,11th,12th standards.

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See for achieve upsc exams study the syllabus of 6, 7 , 8 , 9 , 10 class books and inter books we can achieve very good marks in upsc exams 
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