The necessity of speaking foreign language at school during the whole day

Why lots of pupils studying in the special linguistic schools, gymnasiums and lyceums cannot speak any language after their graduating?

Why after so many efforts I could not speak?

The lessons of foreign language should be realized on foreign language.

All the announcements, timetables and reminders should be written on foreign language.

The conversation outside the classes should be in foreign language.

Studying on foreign language.

It must be maintain constant discipline and clear organization.