Duolingo Practice always starts with the easy lessons
Everytime I press the practice button, it makes me practice the early lessons. I don't get to practice the later lessons (unless I manually press on each lesson). This makes the practice not as beneficial.
I wish Doulingo could change this, so that the lessons that need most practice are practiced instead of always starting with the earliest lessons. If you agree, please like this post so that it gets Doulingo's attention. Thank you.
Duolingo's algorithms don't actually directly keep track of how strong a skill is. They keep track of the strength of individual words. The strengthen skills tool doesn't choose the weakest skills, but it does choose the weakest words. Because we don't strengthen the early skills very often, they often have a small number of very weak words. After you use strengthen skills for a while, you'll start seeing words from later skills.
There's some more detail about how Duolingo keeps track of our learning here: http://making.duolingo.com/how-we-learn-how-you-learn
Considering that you have a 539 day streak (which is amazing, congrats!), I assume that you know better. But till now, for me at least, I practice a bit everyday and I'm currently on my 73rd day streak, yet I still get very easy lessons which I can solve with my eyes closed. While the harder lessons have been untouched for days (some for weeks). It's getting frustrating. I really wish Doulingo would find a solution to this.