A way to review the exercise you just finished
It's not exactly a "back" button I'm asking for (and I do apologize if the suggestion has already been made but i could not find a post about it). I think it would be great to have the option "view" (or "print" maybe) my finished exercises. Being able to review your past mistakes is very useful.
Thanks for the suggestion! Right now, you can go back and practice a skill, which will have some of the sentences that you learned in that specific skill along with new sentences.