I agree with Tanit. The ability to grasp cohesion and coherence is not so easy to be estimated. I'm Russian and if in my language some kind of that exams take place, sometimes it's not possible to distinguish unambigously in words why the

I don't share your opinion, as I don't think you can find questions unrelated that have "little to do with the language knowledge", as you put it. Well, everybody is entitled to have his/her own oppinion. I appreciate that.