I am 21 yrs old. I have finished my BBM this year from Bangalore university with 51% marks. I am intersted in doing MBA. Where all I Can try for the same

You can surely apply for most of the B Schools as their cutoff % at the graduation is 50, you should also be appearing for any one of the entrance examinations like CAT XAT MAT or State CET. Apart from that you also need to appear for a round of Presentations/Group discussions and Personal Interview