Bachelors

I can give you suggestions for management. Go for BBA+MBA it has more scope nowadays.

You have many options open after completing your graduation:
1. You can take up a full-time job.
2. You can do an internship.
3. Go for PG/Masters in area of your choice.
4. Work+study (part-time)
5. Go for specialised courses.

Hello,
Yes, rightly said by Dennis V, you must take your IELTS and also German language certification. However, I doubt if Indian Diplomas are accepted. Generally, Diplomas are not accepted and you have to complete the first year of a Bachelor's degree in India before applying to a German university. Confirm with DAAD authorities.

Only way is getting scholarship, if you deserve. Otherwise, you have to pay around 40 lakhs INR including course fee and your living expenditure fee. How to get scholarship: contact respective university you really need to be academically brilliant and top amongst all applicant, so university can decide on investing on you.

Well, both have a great scope. B.Tech CSE is something what you may do so there are lot of opportunities. For Mass communication, you should work a little and explore, though it's a very good and updating field.