Sure and I went to ESSEC after doing my prépa in Tours and grewing up in the countryside. Guess where did 95% of my classmates came from. The plural of anecdata, something, something…
The system is utter garbage as was pointed by Bourdieux decades ago. It’s not even cheap which could have been its sole redeeming quality. Social mobility indicators in France are even worse than in the UK, a case study of what not to do.