NCERT books serve as an essential resource for UPSC preparation due to their foundational concepts in various subjects. Aspirants can effectively utilize these books by first understanding the core syllabus and selecting relevant topics. Taking concise notes while reading helps in retaining key information. Regular revision of NCERT content ensures a strong grasp of basic concepts that form the foundation for advanced study. Additionally, correlating NCERT lessons with current affairs and relevant government policies further solidifies candidates' knowledge and understanding.