The problem here is with the assumption that the problems can be solved by throwing money at them. Typically they can't.
To a very large degree what schools turn out is based on the students that come in. It's the home and the neighborhood far more than it is the schools themselves. You get a better result if you put students with other students of like ability and motivation. This works pretty well at the university level, but historically it was used to discriminate and thus doesn't get done earlier. And, likewise, we are very focused on equality even when it comes at a detriment to the students. (Once again, legacy of it being used to discriminate.)
To a very large degree what schools turn out is based on the students that come in. It's the home and the neighborhood far more than it is the schools themselves. You get a better result if you put students with other students of like ability and motivation. This works pretty well at the university level, but historically it was used to discriminate and thus doesn't get done earlier. And, likewise, we are very focused on equality even when it comes at a detriment to the students. (Once again, legacy of it being used to discriminate.)