They might have falsified the statistics in order to boost people's morale, but they were also very serious about actually progressing. Bulgaria was under USSR

They might have falsified the statistics in order to boost people's morale, but they were also very serious about actually progressing. Bulgaria was under USSR's wing when I was a kid, and I have first-hand experience about that. There was this thing called "kruzhoks", (a Russian word, diminutive of "circle", like in "circle of friends"), which were after-school interest-based clubs, mainly about technical stuff. Every other kid was a member of some kind of kruzhok. Back then I didn't realize that, but the state must have had some sort of "master plan" to prepare as many kids as possible for technical careers when they grow up. I also distinctly remember the exceptional quality of the textbooks (math, mechanics, electronics). The content was presented in a pedagogical order, with increasing difficulty, and carefully selected exercises that helped the concepts sink in. I used Russian textbooks from the 60's and 70's up until I graduated the university in 2005. (I'm a mechanical engineer, physics hasn't changed much since then, heh.) The typography was also excellent. When I first saw LaTeX output, the first thing that came to mind was Russian textbooks. I don't know how they did it back then.