How do I provide services to a student who suffers and lives in poverty?
have access to a device to practice like a textbook or anything
No, Duolingo is an interactive lesson system which is based on gimmicks like streaks, crowns, completed skills/lessons (and language XP 1-25 levels).
The course contributors add content to the Incubator for several courses and staff/contractors maintain the content for their new CEFR (Spanish/French) + Chinese Mandarin courses.
Nobody is writing here a textbook or PDF eBook.
Duolingo is designed as a client-/server web/mobile application where the server stores all lessons and user data.
If poverty means that besides no mobile device (old smartphone/tablet) or computer also no Internet connection is permanently unavailable then I am afraid I have to say that Duolingo is not the right resource.
Does your school offer a computer room which students can access after school?
Are there any shared mobile devices?
I heard that some schools offer tablets or Chromebooks to their pupils?
Free audio courses (e.g. Complete-Spanish, Complete-German) with a PDF textbook download offer: www.languagetransfer.org
100 days courses with free mp3 audio (native recordings): www.50languages.com
There is a cheap text book (Book 2) from Goete Verlag available.
You can also find the 50languages courses as user-created courses on www.memrise.com (web) to be accessible from a computer or browser on a smartphone/tablet.