The marking system for the UPSC Mains examination is structured and rigorous. Each paper is evaluated out of a specific total, with both qualifying and merit-based marks at play. Candidates must achieve a minimum qualifying mark in certain papers, while the rest contribute to the final merit. Answers are assessed based on criteria such as clarity, relevance, and depth of analysis. The evaluation process is conducted by experienced faculty to ensure fairness, with candidates’ performances compiled into a final score to determine selection.