Hi, 

I am sorry but with this AIR its difficult to get a seat in government medical college. 

According to closing ranks of previous year the last closing rank was around 2.5k

Your options can be to either try for private medical colleges or try for deemed universities as chances would be better there.

For further help you can check out the following link:

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu/amp#referrer=https://www.google.com

I shall attach a link for help:

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