This depends on the country you wish to study in, and the language your course will be taught in. If you are not a native English speaker but wish to study a course taught in English, you will have to prove you can speak the language to a fairly high level, by providing English-language test results. This is to ensure you will be able to follow your course without any comprehension problems.
English is also used as a language of instruction in a number of other countries worldwide, particularly for graduate programs and business degrees. English-taught courses will be advertised on the university’s website and can sometimes be searched for using a centralized database run by a national agency.
Common tests accepted as proof of English proficiency are the TOEFL and IELTS. If you need to prove your proficiency in a language other thanEnglish, there are also similar tests in other languages, such as the DELF/DALF and TCF-DAP (French) or the DSF and TestDaF (German).
Before taking a language test, make sure you confirm which results are accepted by your chosen school to make sure you don’t waste money on the wrong test.