Hey dear, cutoff varies every year, if you see the last year's cutoff which went very high that even students getting 500 marks were unable to get a good govt. Mbbs seat. So, with 255 marks being a general candidate you may have chances for bds seat if there is average cutoff, 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