Assessing the credibility of information sources for UPSC preparation involves checking for authenticity, reliability, and bias. Candidates should prioritize sources such as government publications, academic journals, and reputed news organizations. Verifying the author’s credentials and the publication date is essential to ensure the information's relevance. Cross-referencing information from multiple sources helps in identifying consistency and avoiding misinformation. Utilizing platforms like PIB (Press Information Bureau) or established educational websites enhances the reliability of the material used in preparation.