PinParasol t1_iti2xl7 wrote on October 23, 2022 at 8:22 PM

Reply to comment by Creep2Crazies in [OC] Chances to attend a "Grande Ecole (Top university) in France. If you want to attend "ENA", the best university in France, you have 330x chances if your father graduated from there. by pacmanpill

Answering because I don't think someone who doesn't know the system will get the right conclusions out of your comment.

"However, going to a random countryside Prépa and going to Henri IV or Louis le Grand is not the same thing. In the second case, you'll have a significantly higher chance to get a shot at the top schools."
-> Yes. But not because of the prépa. Because the students in these prépas are the best (on paper, at least). Students in prépa are selected by the teachers for their percieved potential. The more prestigious prépas (the most well-known, oldest, biggest, etc) then get the best students. But as everyone is going through the same exam at the end, the prépa itself does not have that big of an impact. A mediocre student in a great prépa will do as poorly as in a mediocre one (I'd say maybe even worse, because the teacher won't slow down for the one student trailing behind and will leave them in the dust). I'll admit there is an issue in the other direction: a great student in a poor prépa might get slowed down by their teachers and the other students and not perform as well as they could have, but that's not the point I am trying to make here. The prépa is far from the main factor in the exam result.

Creep2Crazies t1_itifs67 wrote on October 23, 2022 at 9:44 PM

No, I really disagree with most of what you've said here.

The truth is, you can't really know who is gonna perform on not in prépa based on high school results only. I know about people who were really great in high school but failed in prépa, and conversely people who weren't that great in high school and overperformed in prépa. That, plus as I've said this selection tends to be very geographically discriminating, so if what you've said is true it would somehow mean most of the best students would come from Paris. Perceived potential and real potential are two very different things.

In the next paragraphs, I'll talk about the MP prépa because that's what I went through, but I believe it's roughly similar in other prépas.

The prépa matters a lot because, the most prestigious prépa will prepare you specifically for X-ENS, the middle-ranked will prepare you for the Mines and Centrale, and the lowest-ranked will prepare you for CCP. If you're in a low-ranked prépa but you want to prepare the ENS, you'll have to prepare for it by yourself. That's a very, very considerable disadvantage. Of course there's a common program, but the range of what is studied is way, way bigger in the most prestigious prépa - for instance in my prépa in maths we had additional exercises which we were required to know ; when I compared in my school with other students who came from lower-ranked prépa, some of them didn't even know about some of those exercises. It was not only important to know for X-ENS, it made a big part of one of the Centrale exam kinda trivial.

I believe there's also to some extent the fact that the teachers at the most prestigious prépa tend to be the best ones (because those prépa will be attractive for the best teachers) but I'm not sure how this selection works so perhaps I'm a bit wrong here.

Also, yes, the rhythm is obviously way faster so if you're not good enough in this kind of environment you're gonna fail in a prestigious prépa, and if you're good enough for CCP but definitely not X-ENS you'll likely perform better in a middle-ranked prépa. But I really think there's a very sizable portion of students who are good enough for Centrale and Mines and could maybe get X-ENS with proper training and a bit of luck but who are held back by the prépa they're in.