Common sources of misinformation during UPSC preparation include unverified online forums, social media, and outdated materials. Aspirants often share rumors regarding exam patterns, syllabus changes, or preparation strategies that can mislead others. Additionally, excessive reliance on sensationalized information can skew an aspirant's focus, hindering effective study. It is crucial for candidates to verify sources from reputable institutions or official UPSC notifications to ensure they have accurate and relevant information to inform their preparation strategies.