No. It won't be possible to get an All India quota seat at this score. The cut-off scores usually remain much higher in Tamil Nadu. In 2017, the cutoff for OBC category in All India quota was 572.
To know the complete list of colleges along with cutoff scores, please visit following link.
NEET cutoff Tamil Nadu

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Based upon your score in NEET 2018, and the previous year cutoff, chances are less for admission to Government Medical Colleges under All India Quota and state quota. You may have chances in Private Colleges. Use NEET College Predictor to Check Your MBBS/BDS Chances in All India Quota, Deemed Universities & State Quota seat Based on Your NEET AIR
   https://medicine.careers360.com/neet-ug-college-predictor?icn=neet-clgpd&ici=qna-answer 

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