would like ...
study or research in Germany
Take a language test recognized by all universities in Germany.
Convince research institutions and employers of your knowledge of the German language.

German as a foreign language exam (TestDaF) is a language test for advanced levels, covering levels from B2 to C1 on the six-level Common European Framework of Reference for Languages ​​scale.

If you pass the four parts of the exam in German as a foreign languageTestDaF for the fourth level, the certificate, in this case, is evidence of the language level required for admission to almost all subjects of specialization and study at German universities. Moreover, the TestDaF is internationally recognized as proof of your knowledge of the German language, especially for scientific projects and academic careers.
No specialized knowledge is required to take the exam.

workouts
When preparing for the exam in German as a foreign languageTestDaF Two complete TestDaF exam forms will help you.

Exam forms for download
https://www.testdaf.de/de/teilnehmende/der-digitale-testdaf/vorbereitung-auf-den-digitalen-testdaf/

Additional information about all parts of the exam:

Source:https://www.goethe.de/ins/ps/ar/spr/prf.html