Hi Sanket,

Minor Degree is in all IITs. But it isn't a full B.Tech degree. However, if a student is passionate to study a branch, which he could not get, then he can take a minor in that course. That student is supposed to study his major and minor both hand in hand. 

Yes taking a minor is a step closer to fulfilling your dream, but it is still not a complete B.Tech degree, which means you have to teach yourself lots of things, which won't be in your curriculum. Also, many companies will let you sit for placements, just because of the minor degree, So that's the most beneficial thing of taking a minor.

You'll have to work harder as compared to other students, to balance your work. Keep that in mind.

Thanks.