BITS Pilani - Birla Institute of Technology and Science

BITS - Pilani does not offer any course for aeronautical engineering.

No, you would not be able to surpass the cutoff (which is minimum of 300 out of 450) if you only prepare for the 12th syllabus. The 11th syllabus is as important as the 12th and carries equal weightage (might vary a little bit). It is advised that you prepare both the 11th as well as 12th syllabus. The questions would be direct and easy. Just try to focus on the important topics. Hope you do well.
Best of luck.

Yes, there are good chances of getting an interview call.

If you will work hard, you will be able to get admission in BITS - Pilani. You can refer to class 11th and 12th NCERT books. You should try to solve logical questions, mathematical reasoning base questions and many more.

There is no centralized counselling for any of the colleges. All these colleges have their own separate admission process.

Chances of getting an interview call is less. Write a good SOP for getting shortlisted.

BITS Pilani is top private university for Engineering education equivalent to legacy IITs and has All India ranking of 6. BIT Ranchi is far behind in ranking in comparison to BITS Pilani.

There are moderate chances of getting a call. However, it also depends on your overall profile.

Both the universities are independent and have no relationship. They are independent and autonomous to follow their own admission process.