Dear Aspirants/Guardians

 You just need to qualify JEE Mains to appear JEE Advance, IIT provide admission based on JEE Advance mark.

Cutoff rank cannot be predicted exactly because it depends upon various factors. Score varies almost every year and differs from one branch to another.It may be vary depending on question paper and cutoff rank.

You can go through the below-provided link of Careers360 where you can find cutoff rank for IIT Bombay.

Link for the cutoff rank for IIT Bombay:- https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay 

All the very best and good luck.