IELTS

No, it depends on your course and country.

That is a question you should be asking yourself. Since you mentioned you are from non-medical, that still leaves a lot of options available for you ranging from engineering, arts, business, psychology, economics, sciences and maths just to name a few. What are you interested in? Think, read and learn about various fields before deciding.

You can try for the government Universities like TU Berlin, FU Berlin, Humboldt Berlin, TU Munich, etc. These will accept the scores and do check for your course through the website.

Yes, if you are really very passionate about your Master's degree and have decided in your heart to follow your dreams then don't hesitate and don't worry, you're really gonna be able to do it. It's not that big of a deal. You just need to work very hard and rest assured, the German Universities degree have a lot of weight.

Yes, if you are 16+ in age then yes, you can take up IELTS coaching and appear for the exam.

Hi,
I can talk for IELTS. In my opinion, give it a good 3 months preparation time. Do a regular practice and be consistent. You can actually clear on your own.
1. Enroll in a lot of free courses online like on future learn. There are so many websites like IELTS buddy, IELTS advantage, IELTS Liz etc. to get tips and tricks. There are you tube videos too for visual demonstration.
2. Get Barron's and Official IELTS Cambridge books, I personally think they are very good. Follow them regularly and solve all papers.

Hello,
If you are planning for US universities, it is very difficult to find universities with the score of 5.5. In other words, I can say that one is not eligible to apply in any university with 5.5 score. Many of the universities accept TOEFL still if someone has taken IELTS then he should have passed with at least 6.5 bands. So if you have scored IELTS with 5.5 band, I would suggest you to retake the IELTS exam.

Yes, there are some chances with 6 band, anyways, it depends on the university and the college, I would suggest you check with the concerned university to which you are applying.

IELTS plays important role in admission process. Having good IELTS score will improve the visa chances too.