K. L. Going 
Saint Iggy [EPUB ebook] 

When Iggy Corso gets kicked out of high school, there’s no one for him to tell. His mother has gone off, his father is stoned on the couch, and the phone’s been disconnected, so even the social worker can’t get through. Leaving his public housing behind, Iggy ventures into the world to make something of his life. It’s not easy when you’re sixteen, have no skills, and your only friend is mixed up with the dealer who got your mom hooked. But Iggy is . . . Iggy, and he has the kind of wisdom that lets him see what no one else can. Includes an author’s note.