Hello gaurav,

Before answering i would like to inform all the institutes mentioned above are quite good they are ranked as follows: IIITM gwalior>iiit guwahati>iiit kottayam,Well it depends on which cource you will like to do,cause in iiit Gwalior there is no btech cource in IT but rather a dual degree in which you can either choose btech+mtech or btech+MBA. Where as in iiit Kottayam there is a btech cource in cse. Well when it comes to college iiit Gwalior is better as it was established in 1997 where as iiit Kottayam is established in 2016. So at last it all depends whether u want to do a single degree or dual degree course.

Hope it helps