If you have lost your 10th (SSLC) marksheet roll number, you can still get the information and a duplicate marksheet by following these steps:

First, contact your school where you studied. They usually have a record of your roll number and marks. They can provide it or guide you on getting a duplicate marksheet.

If the school cannot help, you can approach the State Board of Education (like KSEEB for Karnataka, or your state board). You will need to apply for a duplicate marksheet. Usually, you must submit: your name, date of birth, year of examination, school name, and any ID proof. There may be a small fee.

The board will issue a duplicate marksheet, and this will include your roll number.

Website for Karnataka SSLC board: https://kseeb.karnataka.gov.in