The French language, a legacy of colonial rule, is spoken by many educated Vietnamese as a second language, especially among the older generation and those educated in the former South Vietnam, where it was a principal language in administration, education and commerce. Vietnam remains a full member of the International Organisation of the Francophonie (La Francophonie) and education has revived some interest in the language. Russian, and to a lesser extent German, Czech and Polish are known among some northern Vietnamese whose families had ties with the Eastern Bloc during the Cold War. With improved relations with Western countries and recent reforms in Vietnamese administration, English has been increasingly used as a second language and the study of English is now obligatory in most schools either alongside or in place of French. The popularity of Japanese, Korean, and Mandarin Chinese have also grown as the country's ties with other East Asian nations have strengthened. In the High School Graduation Examination, foreign language exam can be one of the following: English (most), French, German, Chinese, Japanese, Russian or Korean.