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Also See: UPSC IAS Mains question papers (2016-23)
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Generally, it depends on individual knowledge and personal qualities such as concentration, memorizing capacity etc. that may determine how much time he/she would need. However, given the vast syllabus, it takes about 1 year to prepare for the IAS exam.
UPSC CSE preparation strategy along with best books for prelims as well as mains exam for sure success.
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