Common European Framework of Reference?
What would be the level (in relation to the CEFR) if I finish the Norwegian course? Thanks in advance.
You wouldn't finish at any consistent level. CEFR exams cover speaking, writing, reading and listening. Duo does some of those much more than others, so you'll end up much better at some than others. Also, CEFR exams, for a number of excellent reasons, ignore translation entirely, which is most of what duolingo does.