Sorry but the cutoffs of colleges in Tamil Nadu are too high. Even being from obc category you need to score above 550 to get a MBBS seat in any government college there under state quota and for All India Quota your score must be greater than 600.

You can check previous year cutoffs of colleges of Tamil Nadu by going through this link.

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

You can also predict  what colleges you might get with these marks by going through the link of neet College predictor tool given below.

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

Hope it helps.