That would be remarkably good retention. I guess it's way worse than that on average, at least for stuff crammed once with no more interest than passing an exam

That would be remarkably good retention. I guess it's way worse than that on average, at least for stuff crammed once with no more interest than passing an exam. Back to the main point: yes, school is very inefficient, but I think the problem of student apathy and disinterest for the subject matter is in more urgent need of fixing than retention itself.