The examination schedule for UPSC Civil Services is planned annually, generally starting with the preliminary exam in May, followed by the Mains in September or October, and the interview round in early the following year. This annual cycle allows candidates adequate preparation time and aligns with the academic year for many aspirants. Announcing dates well in advance helps streamline the preparation process, while changes in the schedule, if any, are promptly communicated. Adhering to this timeline is crucial for candidates to strategize their study plans effectively.