Hey
The cutoffs for all the categories vary every year. Butif we consider the previous year cutoffs for OBC category for MBBS  in kerala , then it was approx 500-550 fpr OBC category for government colleges. So expecting a rise of 10-20 marks this year , you can predict the minimum estimated score to be somewhat around 510-560 this year .

To predict the list of colleges where you can get a seat on the basis of your NEET rank , you can use NEET predictor tool;
https://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer