Is "Strengthen Skills" only repeating the last lessons?
I have the feeling that Strengthen Skill only focuses on the last lessons taken. I recently finished the full Swedish course and I really want to keep up my knowledge, but I almost never get any material anymore from lessons earlier than the last lessons after the last checkpoint or so. I experienced this when going through the course as well. There is a lot of material that I am still not confident with, but I really have to look the particular lessons up way back in the course. Is this something intentional DuoLingo does?