Norwegian (Bokmål) CEFR placement test by Folkeuniversitetet
Try this CEFR Common European Framework placement test by the Folkeuniversitetet
Personally thought the results were pretty accurate for my level :)
Read about the CEFR here
Good luck and best wishes
Thanks for the link. That was fun! I got: Vocabulary and grammar B2, Reading ≥C1, Listening B2. Those were all higher than I expected, so I was pleasantly surprised. My real speaking score (not self assessment) would surely be low compared to these, though. I get almost no speaking practice.
I have never taken any courses. I started teaching myself 2 years ago using whatever material I could find on the web. After about 6 months, I started a written conversation with a coworker in Oslo in Norwegian. We have only met in person once, but we chat every day. I save all of her emails (318 so far) and study them whenever I have time. So now I can read and write but the only speaking I have ever done is to myself.
Learning with several different approaches at the same time helps me a lot. I try to get most of my media in Norwegian - movies, music, reading the news, reading novels, listening to NRK podcasts and so on. When I learn a new word in Duolingo or through my email chats, I tend to remember it when I hear it again on the news or read it in a book and it gets more firmly stuck in my head than it would have using only Duolingo.