Hello Hitesh,
Firstly I want to tell you that you came to the right place to search for answers and have your queries solved and we will try our best to help you make the right decisions.
Management quota is basically the reserved seats of any college for their admissal and this is used for those candidates who may not make the cut off or the merit lists of the college. Since these college are under university norms, their admissions procedure and quotas are governed by The university. However the reserved seats will help them bring admission of various kinds in their institutions.
My advice to you is that you contact St. Johns Medical college's Admission team and this will help you out as they are the ones aware of the admission procedure.
Also, I need to tell you that most colleges dont keep there management quota procedure on the website of the college, all information is available with the admissions officers or office staff.

Hitesh, Do mail the authorities and they will get back as soon as possible, with the right amount, as
the management quota procedure and fee varies from individual to individual and college to college.

For example, Non domicile and foreign nationals may have a different procedure and amount with additional documents, etc.

I hope this helped you out!

All the best!