Colleges in Mangalore

Check out the link below and click to know the college cutoff:
https://www.shiksha.com/b-tech/resources/kcet-college-predictor

Following are the best options for you:
St. Joseph Engineering College
Shree Devi Institute of Technology
Sahyadri College of Engineering and Management
Srinivas Institute of Technology

School of Management is very good option for MBA. You will get great learning experience and can study in an international campus. All faculty members are research oriented and have industry experiences. More than that, the University is Ranked 1 in recent ranking by The Week. I would say you should join School of Management and have a great exposure and learning experience.

Hi,
In Mangalore, you will not be able to get top colleges with these specialisations but you can find colleges with other specialisation.
https://www.shiksha.com/mba/colleges/mba-colleges-india?uaf[]=location&ts=5620121&rf=filters&ct[]=143&ed[]=et_20

You have got good marks, but NIT, Surthkal, Karnataka comes under the top list of NITs.
Not only this, they both are famous for their mechanical branch after NIT, Durgapur and Surat.
So, 139 is not enough as the admission in those NITs starts from 180+ for home quota and 250+ for other state students.
But as you mentioned you are an OBC category student, you have very slim chances to get into it.
I will prefer to give them top priorities in the choice filling.
All the best.