I was waiting until I was halfway through my lessons, but now I don't see it!
On the rewritten website is doesn't exist anymore.
Yes, unfortunately the progress quiz no longer exists in the new version of the website.
The announcement about the new and updated faster website is here.
But why remove the quiz?
I don't know - I wasn't the one who made the decision. Look at the discussion buck72 provided and you will see some good suggestions.