Hello aspirant

The admission will depend upon the rank you scored in JEE Advance. For admission in IIT BOMBAY, you have to secure rank under 1000 for core branch (may vary depending upon different category and branch). However, if you can get around 2000 rank as well, you can secure admission at IIT Bombay. But for branch you have to secure good rank. And marks will vary according to the difficulty level of exam. As the exam is difficult your rank will be good at low score, but if exam is easy comparative your rank will not be good at low score

For more detailed information go through the below link.

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