Hi Karthik
According to this marks there is very low chance that you get Government Medical College in Tamilnadu because according to previous year cutoff the cutoff marks was almost 500 aur above even for the state quota OBC category the marks work above 500 as you can see the competition is very tough for government medical colleges in Tamilnadu
For more details regarding the cutoff of Neet Tamilnadu for previous year kindly refer the link given below

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

Keep trying all the best

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