B.Sc

Yes, you can pursue B.Sc with Hons in Psychology. But that is called Psychiatry, not Psychology. The field of Psychiatry is rooted with medical Science. You'll easily land yourself a job at any Mental Asylum, or Hospital seeking medical specialists in Psychiatry.

If you want to achieve something you have to face a lot of difficulties. If you think that you have selected a wrong stream, you can change it but after that you can not make any excuses. Once you choose it, you have to face all the challenges that comes in way.

You can pursue B.Sc, and prepare for NEET 2017 along with it. It is up to you.

Students who have passed 10+2 board examination (any stream- science, commerce or arts) are eligible to pursue this course. Minimum marks criteria may exist in case of some institutes (usually around 50% aggregate marks).
If you have the above eligibility then you may take admission in B.Sc in animation.

It depends on the stream you are from. If you are from science stream then it won't be a problem, but commerce or arts stream students are not advised to take up this course.

You should opt for B.Tech in CSE. It has better scope.

Interesting question - please refer to below link:
https://www.google.co.in/about/careers/

If you are passionate about designing field, then opting interior designing is not a bad choice. But, if you are opting the field just out of curiosity, then I must tell you that interior designing demands a lot of detailing and concentration along with the hard work. It will take 4 to 5 years to get a high paying job after the course.