There isn’t a formal defined cut off. You need to score above 60%ile and need to have strong academic and cocarricular background. Aso, need to perform well in the Case discussion and PI.
A lot depends on how you fare in your PIs. Sometimes experienced candidates with low percentile but great profile find a place in the institution.
My suggestion for a fresher would be to get a good 75+ percentile and perform well in the pics and then you are good to go!