yeah, kinda why we could go back to text's from 1900 for English, Chemistry, Biology (yes there have been some updates here like say DNA).You will notice this fault line in a lot of places if you pay attention....moderns tend to be sure that they are the greatest humans to ever walk the Earth and are very wise, but over and over again it is obvious that they cant do what there ancestors did, they dont know as much as their ancestors did.
But also need to not promote up to the next grade if they dont actually pass.