To get IIT Bombay how much marks is required
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JEE Advanced: Sample Papers | Eligibility Criteria | Syllabus
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JEE Advanced maximum are not defined
Maximum Marks vary every year like below:
2017- 366
2016- 372
2015 - 504
2014 - 360
So, it is difficult to predict marks as exam pattern and marks change every year but you should score more than 50% marks to get good branch in Top IITs.
To check the cut off rank you can refer below link
Good luck!!

JEE Advanced 2025 Sample Papers
Solving the JEE Advanced paper's will help to know the exam difficult level and identify the high weightage topics.