The UPSC manages the reservation policy in civil service appointments by ensuring a specific percentage of posts are reserved for Scheduled Castes, Scheduled Tribes, and Other Backward Classes. This policy aims to promote social justice and provide equal opportunities. The implementation is done as per the directives of the Government of India and is subject to change based on legal and policy developments, ensuring compliance with constitutional mandates. The policy is a key aspect of UPSC's commitment to inclusivity and representation in civil services.