under the newer 'Studio 21' series which follows the same CEFR standards. audio files for the listening portion of the test, or just the written answer key Studio D A2 Sprachtraining Lösungen | PDF - Scribd
Specific answer keys for the A2 level can be viewed or downloaded from Language Training Solutions: Additional solutions for the Sprachtraining component of the A2 level are also hosted on Alternative Study Materials Studio D A2 Testheft Mit Loesungen Pdf BETTER
For self-correction, you can find the Lösungsheft (solution key) on platforms like Loesungen-Welt or browse student-shared notes on Mock Tests under the newer 'Studio 21' series which follows