How to cheat in Norwegian...
... learn some Danish and Swedish first!
Purely thanks to the Danish and Swedish I'd already learned, I've just managed to propel myself to level 8 in Norwegian on the initial placement test!
Have any of you had a similar experience?
(By the way... congratulations and mange takk to the course creators!)
What you describe is my experience of failing the placement test after completing the Swedish tree: I probably reached fairly high-level questions, but didn't pass in any individual skills due to all the small differences.
It's probably the easier topics that you're more likely to fail actually, because I'd guess that the more important, common words are more likely to differ. Like, you're not going to guess what 'spiser', 'gutt', 'unnskyld', 'jenta', and 'snakker', are from Swedish. Maybe from Danish.
I would guess that knowledge of Swedish might help you a bit more once you get basic Norwegian skills sorted out, if you wanted to test out?