Hello, 

As you have mentioned that your neet score is 511 marks and you fall under obc category. 

First of all its a nice score. You did well. Don't lose hope.

There is a total of 2900 seats in Government medical colleges in TN. Out of which 2447 are for state quota. Then for MBC reserved 490 seats.

So, you have fair good chance to fetch a seat in government medical colleges in Tamil Nadu.

For furthermore information please go through the link given below to predict the colleges you may get :

https://medicine.careers360.com/neet-college-predictor

I hope this would help you. For further queries please feel free to write me down in the comment box.