Jasperactive Lesson exercises are available for access in two forms - Learn and Practice. Learn is a single attempt only option; this will be your first introduction to a feature or skill. Practice is an option that allows unlimited access to Exercise tasks - i.e. to finish or re-attempt work, remediation (relearn), or as the name indicates, extra practice/review.
The image below depicts multiple stages of the Learn mode - 1) completed successfully (Correct), 2) completed unsuccessfully (Incorrect), and 3) Not attempted yet (Required).
Bullet 4 depicts (not shown in image above) when a Lesson exercise begins but is "Saved" before work is complete or submitted for grading.