Hello student,
Yes, With a score of 515 in obc category, you can secure a seat in motilal Nehru medical college when comparing the results of previous years. Last year,  a score of 465 was enough to fetch a seat in Motilal Nehru medical college in obc category under the state quota. But one thing to keep in mind is that scores and ranks vary each year with difficulty level of the question paper 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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