With the TestDaF, you provide proof of your language skills for studying at university in Germany. ISK prepares you for the TestDaF examination. You can take this standardized test at the ISK in Hannover. You can sign up online at www.testdaf.de.
You can reserve a spot for taking the examination for €195 (TestDaF price) directly when you register for the examination course. A direct registration is possible online at www.testdaf.de.