what is the cut off for sitm and i am expecting around 55-58 marks what percentile could i expect

Hi karthik,
SITM cut-off will usually be around 65th percentile
A raw score 53-55 should get you that percentile
I would say that you are very likely to get an interview call
If you belong to a certain caste category, then an interview call is certain.
In either case, start preparing for GDPI
Interview call is just a foot in the door.
You gotta make a committed preparation to crack interviews
Wish you best of luck:)