To apply for the UPSC Civil Services Examination, candidates must meet certain eligibility criteria, including being a citizen of India, holding a bachelor’s degree from a recognized university, and satisfying age limits as per the notification. Generally, candidates must be between 21 and 32 years, with certain relaxations for reserved categories. Additionally, candidates must have a certain number of attempts allowed, which varies based on their category. Meeting these criteria is essential to ensure fair access to the examination for all aspiring civil servants.