The general eligibility criteria for candidates wishing to take the UPSC exam include being a citizen of India; holding a bachelor's degree from a recognized university; and meeting age limits set for specific categories. Candidates must also ensure they meet any required minimum qualifications specific to their chosen optional subjects. Additionally, those applying under reserved categories may be eligible for age relaxations. It is important for candidates to thoroughly review the official notification for the latest eligibility requirements and conditions that pertain to their circumstances.