Indian Institute of Technology, IIT Bombay

Hello Shubham,
There are no particular cut off marks for getting admission into IITs. They vary every year. There are specific closing and opening for every IIT and that too varies.
So, I may say in terms of ranks. Your rank should be below 2000 or 3000 (for general category) to get admission into IIT Bombay for chemical engineering.

IIT, Mumbai aeronautical engineering graduates are able to get starting average salary of Rs 8+ Lacs per annum.

The OBC CAT cutoff for MBA in IIM Indore is 80 percentile. You can check sectional cutoffs for it as well here: http://www.iimidr.ac.in/academic-programmes/post-graduate-program-in-management/pgp-indore-admissions-details/
For other MBA colleges you can check this detail on their website.

The highest package at IIT Bombay is in the range of 42 to 50 lakhs per annum but the figure changes every depending on the domestic and international market

First of all congratulation for getting a decent rank in JEE Advanced.
Now you should decide which branch you want to pursue. If you are interested in civil then you should surely go for IITD. If interested in metallurgical branch, then go for IITB and if still wants to do mechanical, go for Roorkee.