For your application, you need to have a degree from an institute of higher education (ie Bachelor or equivalent).

If your Bachelor's is not in Economics, you need to have at least 30 ECTS in economics courses and 18 ECTS in quantitative methods (Mathematics, Statistics, or Econometrics). You must have a sum total of 72 ECTS in economic and quantitative methods. 6 of the 72 ECTS must be in theoretical Micoreconomics. These 72 ECTS must be acheived before your application to the program. They cannot be handed in after you apply or made up for during your studies.

This prerequisite can be fulfilled with a German Abiturzeugnis with at least 6 years of english. If you are an international student, you can fulfill the prerequisite by studying at an institution of higher education, where English was primary language of study. You may also provide an English Test Certificate. You can find more information in the link below: 

Proof of English abilities

You need to provide proof of your German language skills. This is not necessary if your Bachelor's was done at a German Institute of Higher Education. You can find more information on this requirement and how to fufill it in the link below:

Proof of German abilites.

If you completed your Bachelor's at an institution outside of the European Credit Transfer and Accumulation System (ECTS), you can convert your transcripts to the ECTS system. You should ask the University, where you completed your Bachelor's, to provide a conversion table in your transcripts.