CBSE 10th

Yes, you can apply for the animation course and the fee would depend on the institution from which you will pursue an animation course.
Good luck.

You can admission in this college if you get good marks in the entrance exam and also in class 12th.
Good luck.

Just submit a self-declaration stating a suitable and valid reason for the gap and you will be fine.

You will need 99+ percentile in CAT to get FMS. FMS is usually a top choice just after IIMs. Hence you need to score higher.

More than 99.5 percentile in CAT is required to get the admission in IIM for MBA. You have a good score in 10th and 12th.

Admission in this university is based on the result of the ATMA exam:
https://www.shiksha.com/mba/course/master-of-business-administration-gauhati-university-Guwahati-71254.

Placement is given on the basis of skill and not on the basis of marks. However, the interviewer may at some point during the interview ask about your low grades, at the moment he is not specifically looking for your reason but rather your response. So, react positively and give a good reason. He will be satisfied.

For diploma, they only want your 10th pass marksheet with a good percentage but some of the diploma colleges conducted their own entrance exam.

No chance at all. First, know where you will get admission to apply for visa. You need not try. You can try admission in New Zealand or UK; you will get it.

No, it is not necessary to take computer as a subject for BCA as you will learn from basic itself from the very first year, but it is necessary to have some basic knowledge about what you are going to opt for.