Flaw in the Lessons

There are several lessons that instruct you to click "key squares" before proceeding, some actually require this as no other direction (chess notation) is given to instruct you on what is required of the lesson. However, when you click on "key squares" it treats it as if you partially failed the lesson. When I am practicing knight moves and have no idea where I am supposed to move the knight without clicking on the "key squares" button, it makes it impossible to fully pass the lesson.
The just click on key squares. Honestly, who cares if it partially deducts points or whatever form your score. Improvement is what counts.