Hii!
There is no segregation between grace marks and and marks without it in the NEET UG entrance exam. Its just that you should have scored enough to be able to apply for the exam, that is, to be eligible for the exam. So, your marks will be counted along with the grace marks. The Eligibility criteria for the NEET UG Entrance exam states that the Candidate must have passed class 12th with minimum aggregate of  50% marks ( general category ) and 40% - 45% marks ( reserved category ) in PCB and English Subject ombinations from a recognised Board of education, to be eligible for the exam.  Since, you belong to SC caste, you get benefit. You are eligible for the exam and will not dave any problem.
Hope this helps.
Good luck!

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