If you have forgotten the student registration number, then you have to visit the portal, cbseitms.rcil.gov.in/nvs. Go to the 'Candidate Corner'. Click on the tab- ‘Click Here to Find Your Registration No.’ Enter the candidate’s name, father’s name, mother’s name and date of birth. After this, enter the CAPTCHA code and submit. The Navodaya registration number will be visible on a new page.