hi,
I hope you are asking about IIT Bombay,see to get admission in btech course in iits you need to appear in jee advance exam..based on jee main exam score students will be eligible to appear in jee advance exam. once all of the session of jee main complete, cutoff marks for jee advance will be announced.
hope it would help.
you may follow the below link to know about previous years cutoff
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff/amp

Please provide full details in your question so that it can be answered. Please provide the college name at least.

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