Heyy sri
With 403 marks and belonging to bc category I think you might get govt medical college through state quota in tamil nadu. As oer previous year the minimum cut off of Tamil Nadu for bc under state quota was 357 marks of raja muthiah medical College. Here is a link which has list of all the colleges of Tamil Nadu with their previous year cut off.
https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu/amp

We are predicting this on the basis of previous year cut off trends. We. Are not sure about this year cut off as it changes every year depending on no.of candidates, no.of seats and difficulty of exam. So hope for better result this time.
Here is a tool which can predict college on the basis of neet score. I hope this might help you
https://medicine.careers360.com/neet-college-predictor?icn=NEET_clgpd&ici=NEET_article_view_sticky

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