Prepare for the most stressful years of your life

I have to say I came here without knowing exactly what I was getting myself into. As a international student (even if I speak German at a C1 level) I didn't feel any kind of support from the uni. You will get graded on how well you express yourself in many exams and the professors aren't understanding about the fact that German is not your mother tongue.
There are 6 or more exams each semester. Some semesters you will also have lab courses at the same time that you are writing exams. The organisation is over all very bad.
The people that study this are very competitive so you won't find yourself in a very friendly environment. A lot of the pressure from the professors when it comes to grades. There is no relationship between student and professor.
Don't start studying this if you are unsure. Just do it if you are 100% sure this is what you want and if you are ready to give up any kind of life besides uni.