Hello student,
With a score of 503 in the OBC category, you have chances of getting a seat in government medical colleges, when comparing the results of previous years. For OBC categories, 500 and above can be considered as a safe zone. But every year ranks and scores changes with factors like toughness of the exam and availability of seats. However you can predict the colleges which you are likely to get using the given link
http://medicine.careers360.com/neet-college-predictor
Good luck

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