When I joined Klarna in 2011, the test was so easy that I joked I could score full marks on it even if I was hungover with no sleep. There was one question on the test that actually had 2 correct answers depending on what logic you applied. This was actually a real issue when recruiting, because there was a hard cut-off to make it into the engineering department, and several times I had to ask "what was their answer on question 12?"
It caused quite a bit of commotion at HR to change the official test scoring to 2 correct answers for that question.
Now the test is like a million times harder and your score at the end is between 0-10 and you have no idea how many questions you actually answered correctly. I would be very interested to know the "true" answers of these new tests to understand what kind of crazy logic you need to apply to get every question right. I'm almost certain it would take me longer to understand the answer than the time you have to do the test.
I lost so many great candidates that would be great hires to my teams at Klarna to that stupid test.