Hey Ashu!

You are surely eligible for admission in German universities, however, different universities have different criterias for determining your eligibility; depending on the college you are planning to apply to. Hence, it is advised to visit the college's (in which you are planning to apply to) website and check the same.

Your GRE and IELTS score shouldn't be a problem but the college authorities might ask for the reason behind that drop or you can include the reason in your application as well, as an additional note, to give them an insight into your situation and so that it isn't reflected badly on you and your application, if you have a genuine reason behind that.

For more information regarding German universities, it's requirements for studying there and the eligibility criteria of different colleges, you are advised to visit the following link: https://www.daad.de/en/

Hope this helps. All the best!