This article from Slate is mildly interesting, and mildly horrifying, in spots. It says:
Classrooms in countries with the highest-performing students contain very little tech wizardry, generally speaking. They look, in fact, a lot like American ones—circa 1989 or 1959. Children sit at rows of desks, staring up at a teacher who stands in front of a well-worn chalkboard.
“In most of the highest-performing systems, technology is remarkably absent from classrooms,” says Andreas Schleicher, a veteran education analyst for the Organization for Economic Cooperation and Development who spends much of his time visiting schools around the world to find out what they are doing right (or wrong). “I have no explanation why that is the case, but it does seem that those systems place their efforts primarily on pedagogical practice rather than digital gadgets.”
There are others, quoted in the piece, who suggest some reasons for the comparative differences. Just be sure to mentally insert “on standardized tests” immediately after each use of the word “performing” when you read the rest.