(In One Time Registration (O.T.R.) Process, Candidates can now make changes in their personal details (except Mobile Number, Email ID, Home State and Home District) after issuance of OTR Number.) Complete your one-time registration on the Staff Selection Commission Candidate Portal to access recruitment exam details and related services. One Time Registration for Candidates Please Fill in all the required fields carefully. OTR registration, now Aadhaar-enabled, must be completed online at ssc.gov.in. The correction window for OTR details is open until June 30, 2025. Candidates must register to apply for any SSC recruitment exam.