Which is the top 1 educated country in the world?

I'm curious, which country in the world is considered to be the most educated? I'm specifically interested in the top 1 country, as I understand that rankings and comparisons can be subjective and influenced by various factors. However, I'm looking for a general consensus or a widely accepted ranking system that takes into account educational attainment, quality of institutions, and other relevant metrics. Is there a clear leader in this regard, or is it a more nuanced and complex discussion?