Hello Yogita,

No official cutoff for SIES is declared anywhere. But it is observed over years of experience by the experts that the people securing 80%ile and above are shortlisted and given a call for interview process for PGDM program. There are rare cases of students getting a call at below 80%ile.

Even if you get a call at 77%ile, it is tougher to convert as it is noticed that though they give a call to students scoring 80%ile and above, most of the students who finally convert are having 90%ile and above. 

You can apply and wish for the best, if luckily you get a call, it will then be your turn to convert it.

Best luck!