Strengthen skills should not use unfinished lessons
I am learning spanish and repeatedly get questions from "Verbs: Past Lesson 1" which I have attempted but not finished yet. When using "Strengthen Skills" I sometimes get questions from that particular lesson. I think Duolingo should only test/repeat skills that were previously learned.
I believe that once you start a lesson, Duolingo puts the file into the "strengthen" hat, per se. So, even if you only completed 1/10 lessons from a skill, you will get tested.
I have completed 0/10 from that skill. What I am requesting is that unfinished lessons should not be part of strengthen.