I still have a few texts, workbooks, and programmed instruction booklets from my Avionics "A" and Training Device "A" schools circa 1970, and they are the clearest, simplest, and most retentive training publications I've ever seen. I saw high school dropouts with eighth grade educations (selected by the testing system for their aptitude, not their knowledge) turned into competent electronics technicians in 40 weeks. Those of us who had more education were tasked with tutoring those kids who had educational deficits. I'm mathematically deficient myself, but I and my fast track classmates wound up teaching these guys algebra and trigonometry. Everything was happening at an accelerated pace, and in part time night school we covered three years of remedial high school math in three months. And still had time for flying lessons and the occaisonal evening at the EM Club.