I am pursuing my final year B.Tech IT in Velalar Engineering college, Erode,Tamil Nadu. What exams should I take for doing MBA in IT?

You should take CAT, XAT, SNAP, NMAT, MAT for taking an admission next year in any of the B-schools of India. For this you should start preparing now.

You need to search for all the institutes offering MBA in IT field as there are limited number of B-schools for MBA in IT. Follow the following link for the list of institutes offering MBA in IT- https://www.shiksha.com/mba/ranking/top-mba-information-technology-colleges-india/12-2-0-0-0 Mostly CAT