The format of the UPSC mains answer sheets comprises a traditional pen-and-paper system. Each answer sheet is divided into multiple sections, allowing candidates to respond to various questions. The sheets typically include a dedicated space for the candidate to write their roll number and other essential identification details. Answers must be written in clear handwriting and in a legible manner within the provided space. The word limit for each answer is generally around 150–250 words depending on the question, encouraging concise yet comprehensive responses.