Lost lingots after after NOT starting the Progress quiz
I wanted to explore the lingot shop and clicked the "Swedish progress" measurement quiz. System warned me the it may take up to 20 minutes, so I clicked "Not now", but it deducted my lingots anyways :( Is it a bug or something? How can I restore my deducted lingots?
I see you are in a different situation, because I did have additional 25 lingots to click the button at that time. Hard to tell what's going on here, might be a bug. I recommend to wait until you gain 25 lingots and let's see if it takes you to the purchased quiz :-/
The test has been purchased and you can test for free when you are ready. Note, it is not like timed practice where the skill is always available. Once you take that test, additional tests will need to be bought. Additionally, the test is on the whole course, not just the material you've covered.