Dead on buddy. Exactly what happened in feudal Europe.
The the 9% machinery operators and the 10% riot suppressors have children who might not make it to the 9% or the 10%. They are the ones who will provide aid, logistics, intelligence to the mass of 80%. But if the social machinery operating and the riot suppressing become hereditary, then the situation becomes stable. Children of 1% stay in 1%. Children of the 9% and 10% stay in their "station", since they realize how lucky they are for not being in the 80%, and they fear being dropped into the unwashed masses, they enforce the system with great vigor. That is exactly how caste system in India and the mandarin system in China and the feudal system in Europe survived for centuries.
Among the 9% machinery operators, the top one advice the 1%. They already are pushing the society to a less socially mobile system. Inherited wealth outstrips earning your way into the system. By calling estate duty death tax they are able to pass wealth down the generation more with less attrition. The super high tuition rates is merely an identification system to distinguish the 9% and 1% from the rest so that they are on the track to get the jobs. Basically we are setting up the stage for a few centuries of rule by the 1% with the help of the riot suppressors and the social machinery operators.