Hii aspirants 

Let me clear your doubt .

For getting admission in christ university for bba course you have to give exam conducted by christ university and There is no age limit to apply christ university bba exam.the only eligibility criteria is that you should have passed class 12 exam from recognised college .the student who is in class 12 can also go for this exam but you have to submit your class 10 and 11 marksheet.

I hope my answer will help you out.

Good luck