Hey,

With 520 marks, you will get a rank between 37780-38736. You can check it here https://medicine.careers360.com/articles/neet-result-marks-vs-rank

Based on previous year cut off, you will get a medical seat under 15% All India Quota seats as it closed at 581-590 in 2019. Since you did not mention your state of domicile, I am informing you about all three states.

If you have domicile of Rajasthan, you will not get a government medical seat under OBC category since it closed at 564 marks in 2019. But you will surely get a private medical seat in Rajasthan. To know more about Rajasthan cut off, check here https://medicine.careers360.com/articles/neet-cutoff-rajasthan

If you have a domicile of Andhra Pradesh, you will surely get a government medical college under OBC category since it closed at 449 marks in 2019. To know more about Andhra Pradesh cut off, check here https://medicine.careers360.com/articles/neet-cutoff-ap

If you have a domicile of Tamil Nadu, you will surely get a medical seat in Tamil Nadu under OBC category since it closed at 430 marks in 2019. To know more about Tamil Nadu cut off, check here https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu

To get a complete list of colleges in which you have a chance of getting MBBS/BDS seat, you can use NEET College Predictor https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer