First, all but minuscule % of "elite", get PROFESSIONAL TRAINING of various depth and quality not education in the traditional sense of the word. You can't run (semi) industrial society with stone age people. Thus, olygarchies are interested in having immense pull of docile, somewhat trained but not educated people, diligently working and reproducing the system. All the "educational" efforts from kindergarden to graduate school are directed towards this goal - content, "trained", docile slaves reproducers, not rocking the boat.
"Education" can be used to enslave with the same success as a whip. Just visit the nearest friendly campus, sniff aroma of isolation, very limited knowledge of the surrounding world, I-ll-do everything-to-get-good-job, I-don't-need-crap-which-brings-no-money-or-would-cause-trouble. And that's YOUTH, the most noncomforminst portion of society, behaving like 80 years old retired masters of office games.