Common resources utilized by UPSC aspirants include standard textbooks, respected online platforms, and comprehensive study guides. Essential books include NCERTs for foundational knowledge, followed by reference texts for advanced study. Online resources like video lectures, e-modules, and practice tests are also prevalent. Aspirants often rely on newspapers for current affairs knowledge, while coaching center materials provide structured guidance. Additionally, peer-reviewed articles and magazines can offer deeper insights into various subjects relevant for the UPSC exam.