There is no justice, not even in education. Surely due to free schooling, partially also further education and universities, we are already quite permeable. In contrast to the Anglo-American area, where you can't get a good job without an expensive elite degree...
But justice? Where is that supposed to arise? I have distant relatives who couldn't help their daughter with math (secondary school) anymore at the age of 13... because they never understood it themselves. I can help my daughter with math and physics up to the Abitur... well, with the interpretation of Emilia Galotti, she only managed a grade 4-, she has to get through that on her own.
That means: You can make it from the very bottom to the top. But where the academic child gives 100%, the underdog has to give 150-200%. And only a few can do that.