For exposure to beautiful prose, but English which you can understand read short stories by F. Scott Fitzgerald and his great novel, The Great Gatsby. James Joyce from Ireland also writes beautiful prose that is not complicated, however. The stories of O. Henry and Saki are also delightful reading.
If you are trying to improve your English language skills through reading, I would suggest that you read anything that interests you. Read as many books, magazines, and newspapers as you can. Each author will have a different style and possibly a different dialect of English. The more you read, the more proficient you will be with the language. Read as many different types of sources as you can. A novel will use a different style of language from a newspaper. An editorial article will use different language than a magazine article. Pick the things that interest you. You will be more likely to stick with it and try to really understand the words if you are interested in the topic.
It depends upon whether you want to be proficient as a writer of English, a speaker of English, or both. If you want to improve your skills as a writer of English, you can't go wrong by reading The Elements of Style, by Strunk and White, which is a classic discussion about writing simply and clearly. If you want an excellent model of English prose, you might want to take a look at the works of George Orwell. Two other people who shared the ability to write very lucidly were C. S. Lewis and Christopher Hitchens, who otherwise had little in common.
I would suggest reading books which use proper English, ones that stay away from slang or ones that rely heavily upon regional dialects (but, this will be hard). Examples of good books would be: A Tale of Two Cities by Charles Dickens, The Miracle Worker by William Gibson, and/or Call of the Wild by Jack London.
It would also be helpful to watch English/American television with English captioning turned on. By doing this, you could both read and gear the words pronounced at the same time. Also, some books have been recorded to audio and you could use the audio while reading a book at the same time. This would deepen your understanding (and ability to identify words and say them properly).
(You may have many more suggestions if this post can be moved to the Discussion Board.)
There is good advise above from peers.
A short list of "must reads":
The Old Man and the Sea-Hemingway; The Great Gatsby-Fitzgerald; The Grapes of Wrath-Steinbeck; The Adv. of Huck. Finn-Twain.
Hamlet-Shakespeare; Gulliver's Travels-Swift; Great Expectations-Dickens; 1984-Orwell; throw in some Romantic/Victorian era poets and T.S. Eliot for good measure.
Oedipus/Antigone-Sophocles (Non-British European); Things Fall Apart-Achebe (Africa); The Kite Runner-Hosseini (Eastern); Chronicle of a Death Foretold-Marquez (Latin America); add anything by a Russian in here too for a well-rounded list.
I've picked these (few) books by the following criteria: general interest, readability level, cultural representation, and applicable themes.
Not only reading books, but also you need to read the English news papers, magazines, News letters, Editorial comments, discussions to get a good practice and knowledge in English.
Reading a good book or poem is one of life’s joys, and once in a rare while a good book can change your life forever. Great literature often demands we meet the authors’ ideas on their own terms, and the experience is not always comfortable. Growth seldom is. Submitted for your review are ten literary works that demand much of the reader. Some of you may scorn the choices here, but who among us hasn’t struggled with a book or poem that failed to capture our attention? If that’s you, then congratulations. I have a near-mint copy of “Great Expectations” you can read.