Hello ravi kumar,
The cut-off marks will be changed for every year based on the number of students attended for the exam and also difficult level of the papers. The previous cut-off marks for the sc category much score more than 550 to get seat in the particular college .For more details once visit the below link.,
https://medicine.careers360.com/articles/neet-cutoff-tamil-nadu
Hope this helps you...
College Comparison based on Courses, Placement, Rank, Fee
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile