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OSD Test B1 Certificate The OSD test B1 certificate is a great way to show off your German language skills. It is recognized internationally and based on CEFR standards. The exam consists of written and oral tests. Candidates can take the tests on their own or in a combination. Prioritizing your tasks and practicing regularly is crucial. Also, try to stay calm and use relaxation techniques during the test. Benefits OSD is an official language certification that is recognized
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