CBSE 10th

No, you cannot do master of business administration (MBA) directly after diploma. Diploma is equivalent to +2 and MBA is post-graduation course. For admission in MBA course, you’ll need to be a Graduate at least, as this is a Masters or Post-Graduation Program.
With a Diploma in Engineering you 1st n

Yes, you can join an animation institute to pursue a Diploma course.

After 10th, you can go for any stream like arts, science, engineering or can go for a Diploma course.

You can either send him to animation or graphic designing field or he can also pursue textile designing, fashion designing or other designing courses depending upon his interest. But, make sure he studies hard to either get into NID or NIFT.

For details about the admission criteria please visit the SPJIMR website:
www.spjimr.org

Yes, you are eligible.

Hi,
Eligibility Qualification: 12th (60%); Mandatory Subjects : Commerce, Accountancy
https://www.shiksha.com/bba/course/bachelor-of-business-administration-vit-university-vellore-243338

Hello,
You need to score 99.1 percentile in CAT to get a call from Kozhikode.

Hi,
Don't worry about your scores right now. You can always score amazing in your CAT and expect a call. They have a criteria for eligibility. Try obtaining the best possible score for yourself.