Here are some ways you may use to get your registration number for SSLC.

1. Contact your former school: They have all records about the registration number, so attend them and meet them with such information about your name, date of birth, and the year you passed the SSLC exam.

2. Check Your SSLC Certificate:

You must have a copy of your SSLC certificate from which the registration number will be printed.

3. State Board's Website:

The state board that administers the SSLC examination may have a procedure for recovery of the lost registration number.

You can try to call at their help desk or go to their office in person.

Specific Procedure for Kerala:

If you were a student in Kerala, you may try the following:

Check the official site for Kerala Pareeksha Bhavan to see if there is a provision available for re-obtaining a registration number which has been lost.

Contact Regional Office: Ask the regional office of Kerala Pareeksha Bhavan in your district.

If you still face difficulties, you can contact your local education authority or local government office.