:/ I think, that you should go in and take it, and not panic if you don't know it, just leave it. Or do educated guesses. Those work really well...our set was given the option of taking the practice papers back in June. It wasn't fun, but my class attempted it...noone passed, naturally. BUT! I got a decent score...cos I educated guessed a lot. So...you can just go, well that looks right, and mark that answer. And see where it gets you...

I decided to opt out of the test, because yeah, not at that level by far, and £60 is a lot of money to me...

So, do your best, as our lovely Japanese friends would say. ^_^ Everyone is there in spirit.