MBA/PGDM

You can probably pursue Ph.D or M.phil in marketing or just settle down with courses like digital marketing and analytics from online course providers.

Yes, you may get a seat. One of my friend's ranking was 5000 last year he got a seat in college affiliated to Mysore University for MBA.

Nope, it shouldn't. Although, some companies have criteria of 60% throughout and no ATKT. So, you can skip those companies and apply for the rest.
Best of luck.

A candidate needs to have atleast 50% and above (Open Category) and 45% and above (Reserved Category) in Graduation to be eligible.
Cutoff for MAT is 99.9X percentile.

Yes, decent B-School and off-lately gaining lot of publicity due to its advertising. Have collaboration with Network 18 and SAP and has various companies visiting for placements with good support in placing students and grooming them.
https://www.shiksha.com/getListingDetail/26986/institute/college-G

Chances seem average, I request you to wait till the last round of counselling, admission see huge upswings, so there are decent chances. Good luck.
All The best.

SRM is an awesome place to study mba in Chennai , the placement records can be found in www.srmuniv.edu.in/placements

Online mode is still not popular in India as yet. I would suggest you to go for MBA from IGNOU which is offered via distance learning mode. In addition, if you have more than 5 years of work experience, you can go for Executive MBA.

Dear Akshat,
There is no restriction for open learning degree holder student to appear for management test. So, don't worry about it and just focus on studies. Do well in exam and you will get a good college for MBA degree.
All the best.