Popular reference books for UPSC General Studies preparation include "Indian Polity" by M. Laxmikanth, "Modern History" by Bipin Chandra, and "Geography of India" by G.C. Leong. For current affairs, candidates often refer to Yojana and The Hindu newspaper. NCERT textbooks are also fundamental for building conceptual clarity in subjects like polity, history, and geography. Additionally, "Economic Survey" and "India Yearbook" are valuable for up-to-date information. Checking recommended resources and arranging a systematic reading schedule can significantly bolster preparation, ensuring candidates have a wide-ranging knowledge base.