Hello student,
With a score of 540 in OBC category,  you have chances of getting a seat in the government medical colleges in all India quota when comparing the results of previous years. Last year,  a score of 550 or above remained to be a safe zone for the OBC candidates under the All India quota. But scores and ranks vary each year with 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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