Hello,
If you forget your Navodaya registration number, you can recover it by using the “Forgot Registration Number” option on the Navodaya application portal. You will be asked for details like your name, date of birth, registered mobile number and district. After entering this information, the portal will show your registration number. If it still doesn’t appear, you can contact the Navodaya helpdesk or visit your nearest Jawahar Navodaya Vidyalaya with your ID proof to get help.
I hope this helps you.