It's hard to say the elimination rate by grade. The main elimination stage is generally the second semester of sophomore year, because there are exams at this time, and a large number of students will be eliminated at this time. However, according to the online statement, 60 ~ 70% of students can still go on to college, and most of the eliminated students will continue to go on to college. The elimination rate is very low after junior year.
The main reason is that the schools here are strict.
The way out for the eliminated students is as mentioned above. Most of these students continue to study in ordinary universities or IUT. Those who can enter the Grande ecole are excellent students themselves. Unless there are special difficulties, they will rarely be eliminated and directly employed.