Diploma

Yes he can join our animations and gaming design courses.

After Diploma, you can do graduation in designing like B.Sc in Fashion designing.

B.Tech degree is always considered better than a Diploma. I feel you should go for B.Tech in CSE. It has a great scope.

Yes, you can get a seat in Diploma through lateral entry scheme. As you have said that you have done electrician trade so you can get a Diploma in electrical, ENTC, mechanical, CSE and IT. You have to appear for the lateral entry test conducted by various colleges for the admission. According to the

Some known institutes are NIBM-Pune, IFMR-Sri City, TAPMI, IIT-B/D/K. Check the below link for colleges offering PGDM in Banking-
https://www.shiksha.com/banking-finance-insurance/colleges/diploma-courses-india

If you have passed in the SC (class 10th), then you can apply for admission in the Diploma in Engineering - Three Years Duration Course. (As per New Rules of many Government, so % is not mandatory, Pass is okay).

With the above-said marks, yes you are eligible to apply for Diploma in civil engineering.
For more details, click here:
https://www.shiksha.com/engineering/course/diploma-in-civil-engineering-m-s-ramaiah-polytechnic-s-r-nagar-bangalore-166098

Kindly visit this link:
https://www.shiksha.com/engineering/course/diploma-in-chemical-engineering-veermata-jijabai-technological-institute-matunga-east-mumbai-203510

You will get your answers in the link below:
https://shiksha.com/b-tech/resources/jee-mains-college-predictor
Good luck.