In Finland the number four is like any other number. Not considered lucky or unlucky. It's just a number.
But based on your performance, if you get a school grade 4, it means you have failed. Totally. Not because you were unlucky, but because you didn't study or just because you were in that subject so bad, that there wasn't even a hint of intelligence or some sort of attempt to do things better. Like a 5 or a 6 would be.
No, a four.
Failure.