Sudha, this largely depends on the State you belong to. For starters, for a Candidate belonging to OBC, he /she should score 40 percentile of the top NEET score. That is the cut off. Now cut offs change every year and are dependant on various factors such as no.of Candidates appearing for the exam, no.of Candidates qualified, top NEET score and difficulty of the exam. Few States like Delhi, Bihar, Rajasthan have relatively higher cut offs than States like UP, Punjab, etc. In 2018, 429 was the cut off for OBC in UP but in 2019, even 537 marks couldn't get a MBBS seat even after 2 rounds. So if you want a MBBS seat under OBC Category, you should aim for nothing less than 600-625