Official exams

There are different official exams to test and clasify the level that a person has in a determined language. I'm going to tell you about the most important ones:
English: The Cambridge exams are recognised in many different countries fromall around the world and are required in most of European universities. There are also different types of exam depending on what you want to test, for example, business English.
The American version of the Cambridge exams is the TOEFL, which is required in the USA and also if you want to get the Australian nationality.

French: You can test your level of French by taking the DELF (Diplôme d'Études de Langue Française) exam or the DALF (Diplôme Approfondi de Langue Française).

German: You can take the Goethe Zertifikat Deutsch to test your level of German.