MBA is one of the big job oriented professional programme which help you to enter corporate world with wide exposure and great amount of knowledge. If you want to get admission into top B School then there are many MBA entrance exam like CAT, CMAT, MAT, XAT etc. in which you need to apply & try to score well in the exam. As per the eligibility you should be graduate in any of the field.

Here are top MBA entrance exam you can go through with given below link.
https://bschool.careers360.com/articles/top-mba-entrance-exams-you-must-take

Good Luck!