Hi

You you don't need to worry your grace marks will be considered

This is because,

It doesn't matter whether you have passed  your  examination with Grace marks or without grace marks, what matters is that you have passed in your examination as :

Neet eligibility criteria doesn't mention anything about Grace marks it just says that you must have passed in all the 5 subjects including physics chemistry biology /biotechnology and English and meet the percentage requirement in PCB which provided below:-

you must have passed 12th board examination with physics, chemistry ,biology/biotechnology and English and must have got at least  50  % in aggregate of PCB  i.e Physics, Chemistry and Biology  in 12th examination  if belongs to general category , or   at least  40%  in aggregate of PCB if belongs to  Obc/ Sc /st category.

So,
if you meet the percentage requirement i. e 50% in PCB aggregate if you belong to general category or 40% in PCB aggregate if you belong to OBC or SC or St category even with Grace marks then you are eligible for Neet 2021 examination .

Also,
to be eligible for neet 2021 one has to be at least 17 years old or more by  31st  December 2021

For detailed information about neet examination eligibility go through our page for which link is provided below; -

https://medicine.careers360.com/articles/neet-eligibility-criteria

Thank you