NCERT textbooks are critical resources for UPSC exam preparation, providing foundational knowledge in various subjects. They cover essential concepts and themes in subjects like history, geography, polity, and economics, which form the basis of the UPSC syllabus. Aspirants are often advised to start their preparation with these textbooks as they simplify complex topics and present information concisely. Furthermore, NCERT textbooks help in building clarity and confidence in fundamental concepts, making them an indispensable part of the study plan. Their systematic approach aids candidates in establishing a strong groundwork for advanced studies and revisions.