Hello student,
With  a score of 512, you have chances of getting a seat in the government medical colleges of Bihar. Last year, 519 marks secured a seat in Government medical college, betiah in state quota. But every year scores and ranks changes with difficulty of the paper and availability of seats. However you can predict the colleges which you are likely to get using the given link
https://medicine.careers360.com/neet-college-predictor
Good luck!