Oxford Placement Test - Wikipedia
https://en.wikipedia.org/wiki/Oxford_Placement_TestThe Oxford Placement Test (OPT) is an on demand computer-adaptive test of the English language for non-native speakers of English, reporting at Pre-A1, A1, A2, B1, B2, C1, and C2 levels of the Common European Framework of Reference (CEFR). The test was developed by Oxford University Press (OUP) to provide institutions with a quick, reliable way to place English language students into the correct level English class. Placement testing is a key stage in the learning cycle.