Hello,

Since you’re from the ST (H) category, you have certain relaxations. For NEET, the eligibility criteria usually require a minimum of 50% in PCB aggregate for general category candidates and 40% for SC/ST candidates.

As you got 53% in PCB (excluding grace marks), you're eligible for NEET, as the requirement for ST category is typically 40%.

The grace marks won't affect your eligibility for NEET or your admission as long as your aggregate percentage meets the required threshold. Just make sure to confirm specific college eligibility requirements, as some colleges might have additional rules, but overall, you should be fine!