Can you suggest some good MBA colleges that provide admission without any entrance exam? I've got 51% in my graduation.

But students should have atleast 65%+ marks at UG level to be eligible for direct MBA admission. Here is the list of some of the colleges in India that offer direct MBA admission without entrance exam score: - R V Institute of Management, Bangalore JIMS Delhi Indus Business Academy, Bangalore JIMS

There are a lot of tier 2 and 3 colleges which do not consider or give weightage to entrance exams, rather conduct their own written exams. The selection criteria shall include the amount of expenditure you want to incur for your MBA/PGDM, which specialisation you want to take, what location you are

No good college accepts direct admission with less than 65% in UG course so consider writing an entrance exam but if you still want to take direct admission without any entrance exam with 51% then you will end up in not so good college so start preparing and write some good entrance exam.