I completed the tree today, after eight months.
Bravo! Io so che non e facile. (I do not have accents on this keyboard.)
Excellent! Now try the reverse tree, a very useful experience with new vocabulary and phrases. And then get to level 25! Ciao!
For instance, you learn Italian from English and after completing the course you start English from Italian. I've done so and find it very useful. Ciao!