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Duolingo English Prep
Duolingo is an American edtech company that produces language-learning apps and provides language certification. On its main app, users can practice vocabulary, grammar, and pronunciation using spaced repetition. From the date of registration, you have till 21 days to take your test. Even though Duolingo's acceptability is growing very fast, you should check the institutions that accept the test score before you register to take the test.