CBSE 12th

Yes, you can take admission if your score is good in NEET.

No, your marks in NATA and 12th boards is not enough to get admission in IP University. Please try for another private university.

No, sorry to say but you cannot take admission in Bhagvan Parshuram College with your 12th marks.

I think, you should opt both Polytechnic via regular mode of education and B.A. via distance mode of education. After this, you'll get both certificates at the same time.

No, it is not mandate to pursue a certificate in French.

Yes, you can take. You don't need to worry. In college, they will teach you from the basics. You will learn it well. And CSE has more scope than others as of current situation.

You need to first decide on your interest areas and long term career objective then based on this decide the graduation course you want to purse. Take one step at a time.

Primarily, concentrate on 12th physics concepts and check some online tutorials available for Class 11 physics and clarify all your doubts. When you study from NCERT for the first time it might be difficult for an Average student to understand. So, go to web and study topic wise which would be easy to understand!

Your question is not clear. Kindly specify what do you mean by directly?

Aspirants should have secured a minimum of 60% aggregate marks (average of all subjects of qualifying examination taken together) or 6.50 CGPA (on a 10 point scale) or equivalent in the qualifying examination for DASA, for more details check out the link below :
https://www.shiksha.com/b-tech/exams/dasa-ug.