https://www.memrise.com/course/337380/dli-msa-6/

I have the Madinah Arabic Course books. You can find them online, courtesy of the author - https://abdurrahman.org/arabic-learning/madina-arabic/

There is also a website with lots of supports and lectures and a much simpler layout than the books - https://www.madinaharabic.com/Arabic_Language_Course/Lessons/

There isnt
Neither duolingo will teach you