At the B2 (Upper-Intermediate) level, you can read a YA (Young Adult) novel or a graded reader. At C1, you need to wrestle with nuance, irony, rhetorical devices, and specialized vocabulary.

: A modern favorite that challenges readers with abstract concepts and atmospheric descriptions. It Ends With Us

For achieving a C1 Advanced English level , it is essential to engage with materials that challenge your ability to grasp implicit meanings and use sophisticated vocabulary [35, 36]. Below are recommended books for learning essay structures and literary works that provide the necessary complexity for C1 level reading. Top Books for C1 Essay Writing & Skills

Reading complex fiction and non-fiction is the "hot" way to naturally absorb C1 level nuances like irony and double entendres [19]. Experts often recommend these classics and modern hits: by George Orwell