Welcome back to the Wefugees Community and thank you for your question.
Unfortunately, people holding a Duldung (including Ausbildungsduldung) are not allowed to leave Germany. Exceptions may apply for students travelling with their school though. You find information on travelling with different types of documents here, for instance. I am afraid that you need to wait until you complete the "Ausbildung" - you know that you can apply for a residence permit subsequently, right?
Sorry that I can not give you a more positive answer.
All the best,