NCERT books play a significant role in UPSC preparation due to their comprehensive content and alignment with the syllabus. Being well-structured, they provide essential concepts and foundational knowledge in subjects like history, geography, and polity. Aspirants find them helpful for both prelims and mains examinations as they cover core topics effectively. Additionally, NCERT books are accessible and cater to varied learning levels, making them ideal for candidates from diverse educational backgrounds. Their emphasis on clarity and concise presentation aids in better understanding, ultimately contributing to a solid foundation for UPSC aspirants.