Hello student yes grace marks is included when you calculate aggregate marks.

You're eligible as you fulfill Neet eligibility -

Candidates must passed or appearing class 12 in Physics chemistry and biology with minimum 50 percent marks from a recognized board.

I request you to please help me with your preferable college you're concerned about so that I can check and provide you with the exact information about eligibility criteria because eligibility criteria might vary from college to college.

Feel free to comment if you've any doubt

Good luck