NO , there is no management quota or any other kind of reservations in Manipal.
I am a student of Computer Science in MIT Manipal and I can tell you for sure that there is no kind of Management quota or donation policy. You get your seat based on merit. That is something that we MITians take pride in.
Even if you wish to join one of the courses that have vacant seats, you need to give the exam pertaining to it.
So, for sure, you can’t buy a seat in Manipal, you got to earn it 🙂