In sweden until high school it's literally impossible to fail. There's no grades and no way of failing anyone.

Then they suddenly become kinda stricter in high school, where your results decide if you can go to university and which.

But I've been to one of the top technical universities and compared to Italy it was very easy. It was obvious the goal was to try and have everyone pass. Still people managed to fail or drop out anyway, although not in the dramatic numbers I saw in Italy for math exams.