You can find books to help English language learners practice writing in the 428 section. Additional books to help college students practice writing can be found in the 808 section. Click here to see a list of sample books and ebooks written for English language learners.
Many English grammar books with practice exercises are near the writing books. Click here to see a list of sample grammar books written for English language learners.
To help you with vocabulary, the library has many vocabulary books, dictionaries, and thesauri written for English language learners. Another way to build your vocabulary is to read a lot, so look at the "read" section of this guide too.