A Klausur in German is a university-level final exam.
I have one this morning for my intensive German class.
If I pass this exam, then I get to take the UNICERT II German certification exam. Which would certify me, I guess, to be middlin’ fluent in Deutsch. (Or level B2 proficient, if you want to use terminology that actually sounds correct.) Before I leave Germany, I hope to be able to take and pass the UNICERT III exam (completely fluent in Deutsch, or level C2 proficient), but I have to take the UNICERT II first. One step at a time.
I’m going to go study. Wish me luck!