Where could I find pdfs of textbooks for learning German? Especially

>>362471
Here are some exercises:

https://www.deutschakademie.de/online-deutschkurs/

I don't know how good they are, but it's free. You probably need some text books too.

>>362474
Thank you!
However I am not actually looking to learn German myself, should've clarified. I need a bunch of textbooks with all their accompanying material for a university assignment. I have to analyse their structure. I'm coming up empty-handed while looking for online copies though. I'd use the set I learned on, but it's old and I don't have the teacher's handbooks.

OP here
In case anyone else is interested, the following blogspot has a wealth of textbooks to go through, plus materials for science lingo and other stuff in German: https://alles-zum-deutschlernen.blogspot.com/
Very few come with a teacher's handbook, however.