Recognized language certificates

Chinese
漢語水平考試 / 汉语水平考试 (HSK)

English 
Test of English as a Foreign Language (TOEFL), 
Cambridge Certificate, International English Language Testing System (IELTS)
Test Of English for International Communication (TOEIC)

French
Diplôme d'Etudes en langue française –
Diplôme approfondi de langue française (DELF-DALF)
Alliance Francaise, Cisco Certified Internetwork Professional (CCIP)
Test d'évaluation du français (TEF)

German
TELC für Deutsch
Goethe Zertifikat
Deutsche Sprachdiplom DHS
TestDaF

Italian
Certificazione di Italiano come Lingua Straniera (CILS)
Certificato di lingua Italiana (CELI)

Portuguese
Certificado de Proficiência em Língua Portuguesa para Estrangeiros (CELPE)

Russian
тест по русскому языку как иностранному (TRKI)

Spanish
Diplomas de Español como Lengua Extranjera (DELE)