How educated is the average Astartes?

So they obviously would be educated and knowledgeable about all things military related as well as in history about the imperium and their chapter but what about other things like the sciences, mathematics, literature, geography, politics, culture and more?

Like how far does their education go in comparison to what we have today? Is it only bachelors degree or like a masters or a phd level? Do we have any excerpts that give us an idea of how educated they are in these sorts of things?

Do they know quantum physics?

Do they have the education for a politician in political science?

Do they know the best literature?

Do they know what the powerhouse of the cell is?