I just took the "already know some of this language" test (or whatever it's called) for the English for Chinese speakers. Chinese is my mother's tongue, so I wanted to improve on it. I looed for a Chinese for English speaker, but to no avail. I later found a English for Chinese speakers, so I was like, "Okay, reverse tree kind of," and started the course.
As said earlier, I took the "already know some of this language" test (or whatever it's called). I didn't seem that hard, as it was actually the language I spoke with my parents when I was very little. (I learned English when I was about 3, but it's my native language now since I grew up in America (actually, growing up in America, nice I'm not an adult yet)). I took that test, and, well, I expected Duolingo to rate me a 30 or 35% percent fluency (I know it's not that accurate, but that what I expected) since I'm not that good at it anymore. It actually rated my a 47% (woohoo!) which was totally surprising, because it took me a year for my Spanish to get that good. Also, it jumped me through more than halfway through the the tree, which was even more surprising because I didn't even know it could do that, and gave my 1600 XP which would actually take me a while to earn. I didn't get any Lingots (I know it's not supposed to, but still) but that's okay because I didn't need them that much anymore.
So I'm just really excited! Thanks for reading this everyone! And please don't down vote this. I'm just sharing my excitement with everyone! :D :D
The English for Chinese speakers course is actually rating your English fluency, not Chinese. Duolingo assumes you are a Chinese native speaker in the course.
For learning Chinese, try ChineseSkill or HelloChinese apps.