"And what do you think that proves exactly? Did you prove that the kids using the old textbooks actually absorbed the more advanced material?" Well, yes, at le

"And what do you think that proves exactly? Did you prove that the kids using the old textbooks actually absorbed the more advanced material?" Well, yes, at least some pupils did. See my comment about degrading exams difficulty and problems in contemporary national competitions. Math problems are fundamental, so it's a good indicator of skills, despite changing times. Science is boring at most times, you can't gamify everything.