It is years since I did this. I remember a couple of the levels were quite frustrating.
I opened the info on one device and the quiz on another. I wrote down all my answers and changed one answer each time. If my score went down, I knew my first answer was correct. I would change that answer back and change one more answer.
Eventually I found which questions were wrong.
I don't know if completing them got me more work with them
They don't seem to have any work near me right now.