Hello Aspirant,

See if you are seeking admission in B.tech courses offered by IIT Bombay or in any other IITs then you have only way known as JEE-Advance. Because such seats are allotted only through JOSAA counselling which is conducted on the basis of JEE-Advance score secured by the candidate in JEE-Advance.

You cannot get admission in it through IMO, so you can appear for JEE-Advance and for this you have to first qualify JEE-Main with the qualifying cut-off as released by NTA for that session.

For more details you can check out the link given below :-

How to get B. Tech admission in IIT Bombay - Check Here (careers360.com)

I hope this information helps you.

Good Luck!!