The best way is to read. Read a lot of English books, magazine. Dont buy buku contoh karangan because the essay in these books are too short. Reading them will not help you to get an A in English. Start by reading simple English books, then secara tidak langsungnya your English level will improve significantly. Check your school library. They usually have short stories written specially for English learners. Publishers (Penerbit) like Oxford, Cambridge and Puffin publish these kind of books.