High school students reading extra-cursory books can help them expand their knowledge and improve their reading ability and thinking ability. The following are some examples of extra-cursory books suitable for high school students: 1. Fictions: Magical realism novels such as One Hundred Years of Solitude and Harry Potter, as well as Chinese classical novels such as Dream of the Red Chamber and Journey to the West. 2. Biography: Reading the biographies of successful people such as "Steve Jobs" and "Liu Bei Biography" can help high school students understand the secrets of success and life experiences. 3. History: High school students can read some historical books such as A Short History of Humanity and Records of the Historian to help them understand historical events and cultural backgrounds. 4. Science fiction: High school students can read some science fiction novels such as " The Three-Body Problem " and " The Wandering Earth " to learn about science and technology. 5. Poetry: High school students can read some poetry collections such as "New Concept Poetry Collection" and "Hai Zi Poetry Collection" to improve their literary quality and language skills. In addition to the books listed above, high school students can also read various types of novels, essays, popular science books, etc. to broaden their knowledge and horizons. At the same time, parents and teachers could also guide high school students to read reasonably and not be overly addicted to it so as not to affect their studies.