How can I take direct admission in MBA without taking any entrance exam?

To get admission into any reputed B-school, it's compulsory to appear and clear the required cutoffs of entrance exams(whose scores accepted by that B-school), meet their eligibility criteria as well as clear the interview rounds. No "good" B-school offers direct admission for any MBA course.

If you want to take admission in top colleges then you must appear for entrance exams like CAT, CMAT, etc.