A 20-year study of 400,000 students found that children who attended public school pre-K earned better grades and test scores through high school than those in other childcare settings. Better-trained teachers and earlier exposure to structured classrooms may help explain why the advantage lasted so long.



That’s what’s fundamentally wrong with us as a appreciate. 20 years and highly specialized, focused question… “But my different question has an anecdotal different answer!”.
The key issue is: these studies look at correlation but you’re arguing from causation. Don’t do that, please.
To be clear: I don’t know where you’re from and have no idea of the education system you’re referencing to - yet the chances are high that I works agree with you in a different setting.
A correlation study about the influence of early exposure to Kong term evaluation in the same system isn’t it though.