Is it possible to change from language learning permit to ausbildung permit without leaving Germany?

Hello everyone, 

Im planning my future visit to Germany and my main goal is to do ausbildung, and therefore, work in Germany. Before actually doing ausbildung I thought that it would be a good idea to go through language courses (B2 or C1) for a few months to ensure my skills and use this time to settle down in Germany, get used to language and culture. So my question is, is it possible to do a Zweckwechsel from language learning visa (16f i suppose) to Ausbildung visa (16a) without the need to return back to my home country? 

Thanks everyone in advance!