Engineering

Hello Santosh,
Oh yes. A student who is a graduate of engineering discipline can surely seek admission in the MBA course offered by Gondawana University. I am attaching a link that will give you all the required information about different programmes offered and all other related information about MB

Yes, B.Tech paasouts are eligible for applying for MA courses.

Yes, IIT Allahabad is still having that much potential, you should give preference to it. Although it will require you to score a really good score to get admitted as compared to NIT's. Placements totally depends on your attitude and your knowledge in the domain. So, work on that and you need not to

Yes, GITAM University provides lateral entry. For further data, go to GITAM University website. All required data will be available there:
https://www.gitam.edu/.

MNNIT is a top level NIT. With 82 percentile, you have a slim chances of getting into it. Though I would rather suggest to work hard and put extra effort for the next JEE in April. To be added, you can try for some other NITs and if you have a state quota you may get preferred in those.

Yes, definitely, there will be sub-streams like-
IC Engines
Boilers
Heat Engines
where we can go for our interested field.

Yes, you can. But, I don't think you will get the top NIT. The newer NITs are the chances and branches other than Mechanical CSE IT ECE Civil in good NITs, you can get. Though nothing can be surely said.

Yes, absolutely, right question. Speaking about agriculture engineering, it's a wide branch where one can easily get government job like AO. In this branch, getting government job is easy than a private job. This branch also has a great future.

No, B.Tech degree will be given if you complete 4 year B.Tech degree programme. You should go for lateral entry in 2nd year B.Tech to complete your degree. All the best.

No, this is not the eligibility criteria to appear in JEE Mains.
It is for getting admission in NITs and IITs.