According to Poland's cultural profile (as in the work of Hofstede)
Hofstede is not the best indicator if you look at how and when the basis of his research was put together but it's still reasonably accurate in the broadest sense.
The thing about education is that to be truly successful it requires two elements. One, it has to encourage development of individual's different talents, skills etc. Not easy to achieve that. Secondly, it has to produce people who can actually think for themselves. If a government doesn't want that, then you have a problem. The present Polish government doesn't really want independent thinkers.
small, barely perceptible baby steps, incrementalism, not revolution)
True educational reform is a process and it takes about a generation to get near achieving it. You have to start at the pre-school level. When you see unsatisfactory students in their teens, the roots lie in early childhood. In Poland you have too many children spending the crucial years between three and six, wandering around the place aimlessly, being infantilized by babcias and fussed over by mothers, having every blessed thing done for them. Some go to pre-schools of course but the quality of early childhood education there is just not what it should be. Countries like Finland where kids also start primary school at seven, have outstanding early childhood education programs.
Another issue of course in Poland is the urban/rural divide. Very difficult to address the quality in education issue when you have a big gap like that. How does one bridge it? None of this is discussed at government level in Poland with any real depth so things won't improve much in the foreseeable future.
Just to add, it's not just the students that are the issue in educational reform. It also requires big changes in methods and philosophy for the teachers. That's why it takes a generation to have any impact. You will meet with some resistance from teachers who have already been teaching for many years (not all, but a significant number) and you need teachers coming into the system who are trained with the new approach.