Hello!

IIT BOMBAY is one of the premium institutions of India .

For B.Tech Admission:

To get admission  in IIT B , you need to get a rank under 300 (All India Rank) at JEE ADVANCED.

Here is the link from where you can check the previous year cut-offs of IIT-B:

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-bombay/amp

For M.Tech :

You need to crack the GATE examination .

For M.Sc :

You need to crack the JAM examination on your Respective subject.

You can visit their Official Website to get more information regarding their admissions.

HOPE this Helped:)