Computers & IT (Non-Engg)

It depends on the institutions. But the fee offered near around 1.5 lakhs to 6 lakhs for three years.

If you get admission in IIT, NIT or IIIT then pursue AI, otherwise, opt for BCA.

Top colleges for cyber hacking in Kolkata are:
1. Indian School of Ethical Hacking.
2. Indian Cyber Security Solutions.

The last date for filling application for July 2018 session is 30th June 2018.

Off course, you will be selected for BCA course because minimum eligibility is around 60% and maths in 10+2.

You have to crack Join Admission Test (JAT) conducted by the Delhi University. On the basis of JAT score, you can get admission.

For more details check the following link:
https://www.shiksha.com/it-software/colleges/bca-colleges-Hyderabad

I would suggest doing B.Sc. As nowadays, IIMs do not prefer B.Tech or BE degree holders.
Even there might be a discrimination against you during the interview due to an engineering background, but it's okay if you want to make your career in the IT field, all you need to do is have some work experience. Else, I would suggest you one more thing, if you are capable of doing your graduation from Germany then you will have a chance to get the job in Germany after graduation. If you want to stay in India go through B.Sc and meanwhile prepare for CAT as well.

You can learn languages like Python, C, Java, and Scala, that are used for designing.

No, it is not necessary. You start a new career after 12th class in a new field.