Some popular books recommended for UPSC aspirants include "Indian Polity" by M. Laxmikanth, "Economic Survey of India," and "History of Modern India" by Bipan Chandra. These books cover critical subjects like politics, economics, and history essential for the exam. Other notable mentions include "Certificate Physical and Human Geography" by G.C. Leong and " Governance in India" by M. Lakshmikanth. Candidates should consider both standard texts and recent publications to ensure comprehensive coverage of the syllabus.