Why doesn't the placement test work?
I have previous knowledge of the language I'm studying yet no matter how well I do on the test it sends me to the very beginning.
I don't think you get lingots when you use the Placement Test, so judging by your username, you might want to skip it.
How many of the questions did you get right before the first one you got wrong?
I didn't keep track of each answer but I was more than halfway though when I got one wrong.
Yes, I finished.
On on unrelated note I don't have a reply button for comments.
I'd put that down to a one-off glitch, then. If you do the placement test and get some things right, it'll put you at least a few lessons through the course. Clear your progress (settings, learning language, reset or remove languages), and add the course again. Hopefully this time through you'll have better luck.
You won't be able to reply to comments yet, or post in any forum other than the troubleshooting one, until you get to level 2. You only have to do 6 lessons to get there, though.