B.Tech Computer Science and Engineering

Every year, VIT takes admission by the rank given by the college. According to your score in the VITEEE, you may see the closing rank in the follow link:
https://www.shiksha.com/b-tech/viteee-exam-cutoff

Marketing students are expected to be creative and innovative. Your previous experience does not matter as much as your ability to sell yourself and the product you are looking to sell.

Marketing is a very innate art for students. The UG doesn't matter as much. It is all about how well you sell yourself and how creative and innovative you are.
So, marketing is suitable if you are that kind of a person.

CS and Me are actually like north and south. Both are very different in terms of scope, salary and types of jobs. But, if you want to earn high and need a very wide scope in future, then opt computer Science in this stream only you can get very much in limited amount of time. And, for more wide expo

MIT Pune is one of the best colleges in Maharashtra for engineering. It has high placement statistics with highest package of 14.32 lpa for Computer Science. Campus placements include companies like :-
Directi - 14.32 lpa
Barclays - 9-10 LPA
Morgan Stanley - 13.4 LPA
Deloitte - 6.5 LPA
You don't have to

No, it will not be possible as the cut-off of BIT Mesra is a score of 150 and above.

It is a good choice. I would recommend, you should go through the syllabus of both IT and CS and have an overview of it. However, in my opinion, there is a little bit of difference in the syllabus of both.
All the best.

B.Tech computer science is a preferred branch in comparison to B.Tech IT because it's acceptance in the Indian and international market. If you have a choice then you must opt for B.Tech CSE over B.Tech IT.

All private college having their management quota, it will depend on you where your quota application accepted or not.