I am mechanical student who is going to graduate in 2022, which college in germany is offering MS in aeronautical i may have 7.5 cgpa at the end?

Aerospace engineering is witnessing a higher enrolment than other Engineering programs in many German Universities. 

Here’s a list of top universities for a masters in Aerospace engineering in Germany:

Technical University of Braunschweig
RWTH Aachen University
University of Bremen
University of Stuttgart
Brandenburg University of Technology Cottbus-Senftenberg
FH Aachen University of Applied Sciences
 

And the best part is there is no tuition fees for these universities

Besides Germany, countries like the United States of America and Canada are popular for their Masters program in Aerospace Engineering as well. You should consider applying to universities in these countries as well.