How do you say, "AARGH" in Greek?

The final exam for my Greek course is in ten days. Learning it has been a blast, but I haven't taken an exam for 12 years (last time I did a Spanish A-level, also as an adult - there's a long personal story behind that). I get nervous when taking exams. Really nervous. 

So I have been revising like mad the last few weeks.

Once in a while I catch myself looking forward to getting this over with so that I can go back to learning more Greek rather than revising the set text for the exam. Clearly, I have got it bad.