Hello,

To correct the mismatch between your OBC NCL declaration and the 10th class marksheet, you can follow these steps:

1. Contact the Authority : Reach out to the institution or authority where you submitted these documents. This could be through their official website or helpdesk.

2. Explain the Issue : Inform them about the mismatch and provide the correct documents that match with your declaration and 10th marksheet.

3. Provide Correct Documents : If required, upload or send the correct documents again, ensuring they match properly.

4. Follow Instructions : Follow any further steps or guidelines provided by the authority for document correction.

Make sure to act quickly to avoid any issues with your application.

Hope it helps !