UPSC publishes final marksheets on its website after the final result is declared. Log in to the UPSC candidate portal using your roll number and date of birth. The marksheet shows your marks in prelims, mains, and the interview separately.
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No, you cannot change your optional subject after clearing prelims. Your optional is chosen in the prelims application form, and the same subject carries forward to mains. This is why choosing the optional at the application stage needs careful thought.