Which is more difficult to get in Harvard University or IIT-Bombay?

There are two ways in which this answer can be answered, statistically and Realistically. 

Statistically speaking, the two colleges can be compared on the basis of their acceptance rates. For IIT, one needs to sit for JEE wherein around 500,000 appear for this exam. To make it into IIT Bombay, you need a rank of 2500 or below. Based on this the acceptance rate is around 0.5% of the total students who appeared for the exams.

On the other hand, Harvard School invites applications from around 10000 students and around 900 are selected out of them. Based on this, the acceptance rate is around 9% which is higher than IIT Bombay. So statistically, it is easier to get into HBS than IIT Bombay. It’s important to note that the above data is not specific and only estimates.

Rationally speaking, both colleges are miles apart, and comparing them is highly illogical.