Hello student,
You have not mentioned which category you belong to or your state. With a score of 509, you have chances of procuring a seat in the government medical colleges when comparing the results of previous years. But it mainly depends on the state of yours. For example, With this score, you have chances of procuring a seat in the government medical colleges of Karnataka while it is not so in the case of states like rajasthan for which the scores are extremely high. However you can go through the following link to know about the cut off's and ranks for the previous years and calculate your chances of selection
https://medicine.careers360.com/articles/neet-cut-off/amp
Good luck

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