Do I have to choose the level beforehand or can I just answer as many questions as I manage to (like in TOEFL)?
It seems that one has to at least choose beginner/intermediate/advanced/business.
I saw that beginner, level 2 includes things like getting along in a bank (I wouldn't know

Where can I download old tests?
I have a copy of a level 2 test at home but it'd be better to have more of course.
Meh, I'm scared, I think I won't do very well w/ so little time to prepare myself for it and then I have to pay it, too *lol* what a waste............