We are telling kids who are good at school that they have better opportunities than others (and kids that are not good at school that they are doomed). Then we are telling kids who are good at school to stay in school. We (including politicians who make policy that entrenches this) are telling kids that being good at school is the key thing needed to earn a decent living.
This is ALL lies.
The fact that we then compound those lies by telling the people who are good at university that they should stay in university and that if they are really good someone will eventually pay them to stay in university is just the icing on the cake of lies.