It may depend on how you access. If you go to "Home Page", you have choices of song progress, lesson progress. Also history and favorites.
It indicates "finish or completed" You should be able to go to "Core Learning System Progress" Lesson with the red guitar pick are ones that are finished. If you have inadvertently skipped a segment in a lesson or not click off as done then you need to find those segments. You can have a lesson 100% but if not click off as (I'M Done) you have to go back and do so.
go to Home Page
click on My Guitar Tricks
click on Guitar Fundamentals 1
It should list every thing as "I'm Done" , (100%) complete or less
Also note that any song or lesson your look through will be logged as some percent of completeion.
I hope my babbling pointed you in the right direction.
Good Luck and happy pickin''