One of the good opportunities to improve your qualifications, even get an additional specialty, and get a master's degree in Germany is the so-called MBA programms (engl. Master of Business Administration).
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The concept of post-graduate study and doctoral study in Germany is combined into one concept "dt. Promotion". If you would like to receive a doctoral degree or PhD in Germany, you need to take into account the specifics of this type of study in Germany.
In Germany, there are many interesting and promising options for advanced training, which can provide an opportunity quickly to obtain a good specialty that is in demand in Germany.
In Germany, there are a large number of different types of internships for students, which they can take during their studies at German classical universities and so-called universities of applied sciences (dt. Fachhochschule), as well as directly after their graduation.