Yes, You can go for MBA after completing MA. There are many entrance exam like CAT, MAT, CMAT , XAT etc. you can apply to get admission in top MBA colleges. To check the other exams you can go through with given below link.

List of top MBA entrance exam

If you want to pursue MBA from Christ University then it takes the admission through CAT, MAT, XAT, CMAT, ATMA, you can appear any of one exam to get admission in this college.

To check the genuine reviews of the college you can go through with given below link.

Christ University Reviews

Good Luck!