Hello,

To correct the mistake, follow these steps:

1. Contact APSC (Assam Public Service Commission) support: Reach out to APSC's helpline or email support, explaining the mistake and requesting guidance on correcting it.

2. Modify your profile (if possible): If the registration process allows, try editing your profile to correct the caste category from MOBC to OBC.

3. Submit a written request: If profile modification isn't possible, submit a written request to APSC, providing:

- Your registration details (application number, name, etc.)

- Clear explanation of the mistake

- Request for correction from MOBC to OBC

4. Attach supporting documents: Include a copy of your OBC certificate or other relevant documents to support your request.

5. Follow up: If you don't receive a response, follow up with APSC to ensure your request is processed.

hope this helps,

Thank you