Hi aspirant,

With 309 marks in neet you have less chance to get government bams colleges. You need to score at least 450 plus marks to get bams seat. You can get private college. This information is based on previous years cutoff and the cutoff marks change every year. It's depends upon number of students that appeared in examination, number of seats available in colleges, difficulties of question paper, reservation catagory, previous years cutoff trends, etc.

You can use neet college predictor to know which college you may get with your marks. That is mentioned below:-

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

Hope this helpful. Best of luck.