Any book recommendations?

Hey, I wanna improve my German for both person satisfaction and because in September I'm starting an Ausbildung and I wanna be as ready as possible.

I have a B2 but I'm confident enough in my comprehension skills to read C1 material too, depending on the subject.

I'm interested in picking up a few German books till then, both because I wanna get back to reading and I think it'll be beneficial to me language skills. I have a couple, Mann, Hesse and Ende books in mind but I'd love some more choices.