Dear Sathya, in 2018 under State Quota 357 marks secured a seat in Rajah Mutiah Medical College under OBC Category. That was the cut off. With  579 marks, you have a bright chamce in every Government Medical College of Tamilnadu. Only Christian Medical College has a cut off more than your score. Having said that, cut offs change every year and are dependant on various factors like no.of seats availble, no.of candidates appearing for the exam, top NEET score and difficulty of the exam. You can check the cut offs of various colleges at:

https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu/amp
You can also use our College Predictor services to check your options:
https://medicine.careers360.com/neet-college-predictor?utm_source=google-search&utm_medium=paid&utm_campaign=neet-clgpd

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