Jabalpur Engineering College

Yes, but you have to qualify JEE Mains with good rank.

If you are getting IET or KNIT, then don't go for Jabalpur, if you can't get any of them, then you can think for Jabalpur Engineering College.

JIST maybe but never in JEC.

Yes dear, you have to visit DTE counseling website. Check this pdf for details: https://goo.gl/DtmNYt.

Yes, every year one of the event is organized. It is organized by the students with the permission of college. Team of students participate in event to make it successful.

Yes, of course.
If you have sufficient marks in JEE, then by the inter college level counseling you can switch your branch but in other branch seats should be empty. Otherwise in second year you can also change branch as well as college. You have to get good result more then or equal to the 8 pointers.

No entrance exam is required and you are from another state so you don't need a domicile of Madhya Pradesh.

Yes, you have a chance. But if any other student who has more CGPA than you comes forward, your chance will get slim.

No, there is no entrance exam. Your percentage in Diploma will help you get a college and about the domicile of Madhya Pradesh, I am not sure but there are too many students who are not from Madhya Pradesh like Bihar, Bengal, Odisha, Jammu, Maharashtra, etc.