Hey listen I just cleared JEE main and advanced this year and I think I have an idea about this. 

I assume that u belong to general and say,
Remember any branch at IIT Bombay is good,
So To get into iit Bombay (some branch )u need to get a all India rank 3000 atleast

And mains has become percentile based and this year do u many years it becomes difficult so i suggest u to score as much as u can or atleast 320+ for all India rank 500 atleast

Hey,
In jee main ,you secure minimum 280-320 marks for top 500 rank . And in jee advanced you score minimum 250+ to get IIT Bombay.
Feel free to ask some more queries and information.
Best of luck

IIT Bombay

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