Progress quiz only lasts one day?
I had some lingots to burn (just enough) so I equipped the Dutch Progress Quiz. I didn't have time to take it at the moment, and now that I return to it the next day, it's another 25 lingots :(
It seems like this is either a bug, or the item description should say that you must take the quiz immediately or lose the lingots.
Did you choose to start the quiz and exit? If not, try visiting the dutch certification page and see it allows you to take the quiz (disclaimer: I changed the country code to nl from sv in the swedish quiz I took, so it may not be 100% correct). It may just redirect you to the home page if it doesn't work.
Edit (speculations and suggestions): Can confirm, starting a quiz and exiting resets the purchase in the store with seemingly no option to retake the purchased quiz. This is most likely an expected feature, but it would be nice to have the option to restart an unfinished quiz. Maybe a button top-right on the home-page that says "You have purchased a quiz but haven't taken it. Take the quiz."