IIT Bombay offers a variety of courses across Undergraduate, Postgraduate and many more Academic divisions. The course you should be studying depends on your Current Academic Qualification and your aspirations. You can check the various Academic Divisions that IIT Bombay offers courses in at their official page: http://www.iitb.ac.in/en/education/academic-divisions . For example, they have separate divisions like Aerospace Engineering, Chemical Engineering, Chemistry, Civil Engineering, etc. And they have various courses within these Divisions. And there is different eligibility criteria for studying in these courses and the opportunities also depend on the course you want to study.So please check the website once.