Taking Arabic a bit further

[amigababy]

Can anyone recommend a book, website or app that could help me take Arabic a bit further.
I'm close to finishing Duolingo' s Arabic course, and loved it. It is a very new course, so it's small and maybe it'll expand later but in the meantime I'd like to carry on. So I don't need a complete beginners course, but also nothing too difficult, as I do feel I've learned to be good at answering Duolingo questions, rather than actively thinking for myself in the language.
TIA

[Gwenhwyfar]

Sorry, can't help, but is it possible to do the Duolingo Arabic on the desktop rather than a phone?