Since you mistakenly filled in your family income as 8 lakh per annum instead of 3 lakh per annum in the NEET application form, you may face challenges in getting the SC Post-Matric Scholarship for private college admission. The scholarship is typically granted based on accurate family income, and discrepancies between your NEET form and your income certificate could raise issues during the verification process.

However, since you have a valid income certificate showing an annual income of 3 lakh , you should be able to rectify the mistake by:

1. Contacting the counseling authority : Explain the error during the document verification stage.
   
   
2. Submitting the correct income certificate : Ensure that your correct income details are reflected in the counseling process.
   
   
3. Writing an affidavit : You may need to write an affidavit explaining the error and providing the correct details.

Since scholarships depend on accurate income reporting, make sure to provide all the correct documents and clarify the mistake early.

I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.

Thank you and wishing you all the best for your bright future.