The UPSC incorporated negative marking in the Prelims in the year 2011. This strategy was introduced to deter candidates from making random guesses and to encourage more thoughtful responses. With negative marking, each incorrect answer incurs a penalty, resulting in a more competitive examination process. This change aimed at refining the selection criterion, ensuring that candidates not only have knowledge but also the ability to make informed decisions under pressure. Aspiring candidates must be aware of this rule while preparing, as it significantly affects their test-taking strategies.