The minimum requirement is usually 65%. The requirement is for undergraduate and graduate alike. In case you don't have the required number you have to improve other acpects of your profile like your extracurriculars. The German scale is a 4 point scale with 4 being the lowest. So you need to convert your score frome Indian Percentage/Grade to German Grade. This can be done through third party evaluation. 

Hi
According to me,
The students are expected to have at least 70-75% from a reputated indian university
They are also required to appear for GRE by some University
A score of above 300 should do the needful.
I hope this information is sufficient for you
Thank you
Good luck