Craig S. Smith explains in Sunday's New York Times.

While French universities are open to all high school graduates, the grandes écoles - great schools - from which many of the country's leaders emerge, weed out anyone who does not fit a finely honed mold. Of the 350,000 students graduating annually from French high schools, the top few grandes écoles accept only about 1,000, virtually all of whom come from a handful of elite preparatory schools. Most of the country's political leaders, on both the right and the left, come from the grandes écoles. President Jacques Chirac and his prime minister, Dominique de Villepin, studied at the National School of Administration, which has produced most of the technocrats who have run France for the last 30 years.