Hello Simran,

This is what happens when you are the stage of finishing your UG course. Though it is difficult to choose but I think it would become easy if you first clear out as to what you are aiming for or what your need is.

1) If you willing to earn money as soon as you leave college, for few years and then do your further studies then go for RBI Grade B exam and study for that.

2) If you to go into academics or their is no rush for you to earn for you want a much better package than want RBI pays to Grade B people then go for MBA.

Both are different fields, you have to decide on the basis of what you want to do. RBI job will provide you finacial stability  whereas MBA an advance learning and specialization in your field of interest.

From 1st week of May online registration for RBI will start so keep checking the notification

if opting for MBA then their are different competitive exams. Here are the list of the exam: https://bschool.careers360.com/articles/top-12-mba-entrance-tests