Hey dear, cutoff varies year to year, if you see the last year cutoff which went very high that even students getting 500 marks were unable to get a govt. Mbbs college. So, with 300 marks if you are expecting bams and bhms ,you will surely get it in 2nd or 3rd counselling, just stay tuned to the counselling. You can also use college predictor through this link:

https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer