That's funny you say that, because I had just re-taken it myself (after not looking at it for a year) and thought the exact same thing. Thanks for taking it.
I think you need to be way more generous with parking assistant. Only 33% of people got it, my guess is most people knew the answer but didn't write the exact right thing, like me.
I think the type-ins may have been to American English oriented, so I have tried to add in a few other common words for a parking lot to give other English speakers a better shot. Thanks for pointing it out! If you have a particular word that you think should have worked, I would really appreciate it if you'd let me know in a reply so that I could add it in. Thanks for taking the quiz!