what is the duolingo's level ?
A1 , A2 , B1 , B2 , C1 , C2 ???
In terms of writing/reading, Duolingo will get you around A2 or B1, but for speaking/listening, Duolingo might get you to A1 or A2.
Common European Framework of Reference for Languages:
Can vary in terms of what type of tree and/or skill you're talking about.