I'm a little surprised that I got 17/20 , although English is my second language and I was always just a mediocre student in English. I know I got better the last years because I read a lot but I still thought I'm not that good. But then there was many of "is it then or than", "is it your or you're" and this was one of the first things we learned because it's so important. Like in German the "das or dass".... It's important and to my suprise always easy for me but for many others not so much....(Edit: autocorrect)