Hey,

With 503 marks, you will get a rank between 45023-51086. You can check it here https://medicine.careers360.com/articles/neet-result-marks-vs-rank

For admission to Manipal College of Dental Sciences, you need to apply through All India Counselling for Deemed Universities.

Based on previous year cut off, you have a sure chance of getting into Manipal College of Dental Sciences. Last year it closed at a rank of 151529.

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