**How does language proficiency affect performance in the UPSC exam?**
Language proficiency significantly impacts performance in the UPSC exam as it affects comprehension, expression, and overall communication skills. A good command of English or the medium in which a candidate chooses to write is crucial for understanding complex questions and formulating coherent responses. Weakness in language can hinder the articulation of ideas, particularly in the Mains examination and Personality Test. Additionally, candidates with strong language skills tend to perform better in interpreting passages and summarizing information. Fluency also enhances the ability to engage during interviews, helping candidates convey their thoughts clearly and confidently.