Common challenges faced during UPSC interview preparation include dealing with anxiety and managing expectations. Many candidates struggle with articulating thoughts clearly under pressure, which can hinder performance. Understanding the interview format and typical questions can alleviate uncertainty; however, personal biases may impact self-assessment. Candidates also often grapple with staying updated on current affairs, crucial for engaging in meaningful discussions. Moreover, maintaining calmness and confidence can prove difficult, particularly when faced with unconventional questions. Comprehensive preparation through mock interviews and feedback can help candidates navigate these challenges effectively.