hello Pankaj,

Congrats for scoring 520 marks in NEET exam. As the cutoff for BDS seats in any college of India ranges between 400+ to 700. As you have scored 520 marks in NEET and also belong to OBC category,you can definitely get a seat in colleges in Delhi or Haryana. You can get top private colleges and also you may get a seat in government colleges.

hope this may help you.