Does <i>anyone</i> ever achieve fluency in school?  I seriously doubt it.  I studied German for four years in high school, and I am most certainly <i>not</i> fluent.  AFAICT, you really have to be immersed in the language for some time to become truly fluent in it.  Studying it in a classroom with only one single fluent person (the teacher) to talk to is not going to do it.