If you want to read some classic American literature in the original version, you could start with some short stories by John Steinbeck.

You could start with "The Old Man and The Sea" by Ernest Hemingway. The plot is really simple (it's just an extended metaphor for Life) but Hemingway uses very direct language that's easy to understand. John Steinbeck is another early 20th century writer who used deceptively simple language. "The Pearl" is his version of a Mexican folk tale, and "Cannery Row" would give you a vivid understanding of California in that era.

Good question, but it might be better in the Discussion section. Ray Bradbury published many hundreds of short stories, most of which use fairly simple language. I don't know if they are considered 'literature', but they are old and dusty, interesting, and pretty quick reads - and several are online. Some I liked include 'The Scythe', 'Golden Kite, Silver Wind', 'Punishment Without Crime', 'The Veldt', 'Interval in Sunlight', 'The Watchful Poker Chip of H. Matisse', 'The Next in Line', 'I Sing the Body Electric', 'Tomorrow's Child', 'Zero Hour', 'Shopping for Death', 'All Summer in a Day', 'The Toynbee Convector', 'The Screaming Woman', 'The Long Rain'.

To Kill a Mockingbird by Harper Lee

Hey guy! I'm English student too, and I enjoy the idea to read something to practice. I'm a teenager and I really like books, so I recommend "Looking for Alaska" by John Green. If you want, you can read some articles too. It's good to practice.