The importance of the Political Science & International Relations (PSIR) optional for the UPSC Mains lies in its comprehensive syllabus, strong overlap with General Studies (GS) papers, and high scoring potential, enabling candidates to excel in the exam. PSIR provides deep insights into governance and global affairs, crucial for civil servants, and equips them with analytical skills, critical thinking, and a strong foundation for the interview stage. Its popularity is also due to the extensive availability of study materials and its relevance for future careers in public administration and diplomacy