International English Language Testing System
The IELTS test is an internationally recognised language and admission certificate which tests knowledge of English in the four areas of listening comprehension, reading, writing and speaking. The test costs 190 euros and is valid for two years. Detailed information can be found here.
The IELTS test (on paper) can be taken in Graz at the Karl Franzens University; see link: https://www.ielts-writing.info/EXAM/test-center-search/austria/graz Preparation courses are no longer available.