Because they give the toughest tests... It's a competitive exam, remember, that has to be selective (the number of student admitted is limited). For example, around 2500 studens take the ESSEC's exam. After the written part, around 700 have the right to take the oral part and in the end, 380 are admitted.
really? here ppl are usually trying to get into the uni they want..there is always a chance that they'll be lucky at exams.
and we always have some 'directions' at uni where there is like 0.3 of person for a place 😑
so if you don't get where you want to you can go there..
for example if i didn't get into med. uni i'd be studying the philosophy of not-alive einvoirment 😊
which basicly is a mix of maths, physics and astronomy.