Candidates can consult a variety of sources for quality study materials for UPSC. Reputable textbooks that cover the syllabus comprehensively, particularly for core subjects like Indian polity and history, are invaluable. Online platforms, including educational websites and forums, offer vast resources, including video lectures and notes. Popular IAS coaching institutes often publish study materials catering to UPSC preparation. Additionally, aspirants should refer to government publications and reports for authentic information. Keeping a diverse range of sources ensures a well-rounded preparation and access to the latest information.