Hei!
Bergenstesten tests for level B2 (if you get the result "bestått") and C1 ("godt bestått"), and is the highest level of testing you can currently take in Norwegian language. What I would recommend would be to begin with the one of the lower levels (Norskprøve 1 or Norskprøve 2), and work your way up. To pass these tests you need to learn not only the language, but also about Norwegian culture and society.
If you're a beginner, start with our beginner or lower beginner lessons.
Håper det hjelper

Bryce
Team NorwegianClass101.com