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History is popularly chosen by IAS (UPSC CSE) aspirants as an optional subject because it overlaps to a large extent with the general studies paper I as well as the prelims preparation. Almost 40% of the history optional syllabus is common with the General studies syllabus, making the preparation much easier.

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IAS (UPSC CSE)- History Optional Success Rate
Approximately 1000-2000 candidates take up history optional for mains, because the syllabus overlaps with general studies as well as the prelims syllabus for the subject. The following are the data which will give you can overall idea about the success rate of the subject in five years:

Table of History book

Table of contents

Volume 1