The story indicates that Sammy has not learned his lesson through several key details. Despite facing consequences for his lack of effort in Mr. Morton's class—being grounded and stressed about completing assignments last minute—he still resorts to procrastination. The narrative mentions that Sammy prioritizes his homework in other subjects over Mr. Morton's reading assignments, reflecting a pattern of behavior where he consistently neglects what he deems less important.
Additionally, the fact that he “still hasn’t learned his lesson” suggests that he has a history of repeating this cycle of neglecting his reading assignments, and the depiction of him staying up late to finish his work at the last minute further illustrates his inability to change his habits. The contrast with Tammy's dedication and her ability to enjoy her weekend stress-free reinforces that while one student is proactive and responsible, Sammy continues to take a more careless approach to his responsibilities, indicating that he might repeat this behavior in the future. This pattern of procrastination combined with a lack of reflection on the consequences reinforces the belief that Sammy may not complete the next activity assigned to him as well.