The evaluation of scores in the UPSC Mains examination is multifaceted, focusing on merit and depth of understanding. Each paper is scored out of a designated maximum, with a total of nine papers contributing to the final marks. The evaluation emphasizes clarity of thought, relevance to the prompt, and analytical abilities. Additionally, the assessment considers writing style and coherence. Each candidate is assigned a panel of experienced examiners who adhere to strict evaluation criteria, ensuring fairness and accuracy in scoring based on comprehensive content knowledge and presentation skills.