I suggest that that the mods move this to the education forum.
We still have students that do well and excel but, the average trends are not good. My son does well at all of his classes and he works hard to do it.
Wrt math, I can understand why this trend exists. The textbooks that I have seen from my son’s classes are horrible. The story problems are written by people that do not truly understand the logic of the Englis language. They are filled ambiguities that force ASSumptions to be made where multiple ASSumptions are possible. If it’s not the same ASSumption as given in the teachers edition of the text, it can be counted wrong.
Another aspect to this trend is that many of the math teachers at the elementary level struggled to pass lower level math courses themselves and have trouble teaching a good problem solving founbdation that they will need later. I did notice that when my son went into middle school, they teachers did become more knowledgable wrt subject matter.
My son’s math teachers are open to parents, like me, that will point out problems that they find in the text. THey will then spend extra time on that pronblem in class. When my son is struggling with a problem and actually needs my help, the crappy writing in the textbook is the source of that problem approx. 90% of the time. If the text books were better written, students would be less discouraged and teachers would not need to spend time on clearing up the mess that they make.