Remember this post (tl;dr: did an A2 Russian language examination after nothing more than Duolingo lessons for two years)? Well, I passed the tests! Performed kind of poorly in the essay, as expected, but still well enough not to hurt my overall score; spoken test went fine (to my surprise), as did the comprehension tests.
That's fantastic! Well done!
What next? Do you think you'll keep going with just Duolingo or will you start adding in some other kinds of resources?