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Official UPSC IFoS Mains optional subject question papers (Papers III–VI), transcribed and readable online. We’re adding optional papers incrementally, subject by subject. For the compulsory papers, see English & GK previous year papers, and for the full syllabus and optional-subject rules, see the IFoS Mains syllabus.
Every paper above is transcribed from the official UPSC PDF, linked on its own page. UPSC does not publish model answers for optional papers. It publishes only the questions.
No. Optional subject papers (like all IFoS Mains papers) are descriptive, long-answer papers. UPSC publishes only the question papers as official PDFs, never model answers or evaluated scripts, for any IFoS paper.
Two optional subjects, two papers each (200 marks per paper, 800 marks total), from a list of 14 subjects. See the full syllabus and barred combinations on the IFoS Mains syllabus page.