Assam

Yes, you are eligible to apply. For further details visit: https://www.shiksha.com/science/course/integrated-b-sc-b-ed-assam-university-silchar-173910

Hi,
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https://www.shiksha.com/careers/air-hostess-8

You have good marks in NEET exam but these marks are not enough to get an MBBS college. There are little chances of getting MBBS college. You can easily get BDS or any other field like that easily but you should try to get MBBS college in your state.
Best of luck for counselling.

Yes, absolutely, while filling the seat allocation. Mention these NITs.

Yes, you are elegible for it and you'll easily get CSE or your desired branch in it. Best of luck.

Yes, you are eligible through your marks. Though, I suggest you to check your eligibility through your board marks, as the minimum marks in most colleges in category students are around 65%, so there you can lack. Otherwise, you are clear. Best of luck.

I guess 70% is good enough to GET admission in some good private engineering colleges. It would be a waste of time to give improvement in 12th and it's not even known that the aggregate would improve or not. If you give improvement, it would take another year, which is why it's better to try out some other engineering colleges.