Children learn from everything, but what will have the most important impact is hard to assess. Most variables that can explain educational achievements and results are highly multicolinear, so saying this has an impact and this has none is really, really hard, maybe impossible. To make an arithmetic metaphor (yes, some school knowledge stick ;) ), I prefer < and > to = and != for social sciences assertions. Even if we like discrete categories because it is makes bold and satisfying statements, using them is always a reduction in precision. Just like in math I guess.
To tackle the question of widespread functional illiteracy, it is necessary to open the Pandora Box of social inequality, as it is generally accepted that the most important variable to predict school performance is the parent's (mother's) level of education.
To tackle the question of widespread functional illiteracy, it is necessary to open the Pandora Box of social inequality, as it is generally accepted that the most important variable to predict school performance is the parent's (mother's) level of education.