What are the main subjects that to be studied for an UPSC level examination? How to be prepared for it?

what are the main subjects to be studied for an UPSC level examination? how to prepare for it?

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Dear AspirantAs you want to know about the syllabus of IAS the syllabus is-GS -CSAT for GS Syllabus is -current Affair-Economics-History-Geography-General ScienceFor CSAT you must read Aptitude from RS Aggarwal book of aptitudes...All The best...