Final answer:
The student's experience in high school can be explained by a lack of social maturity.
Step-by-step explanation:
The best explanation for the student's experience in high school is that the student lacks the social maturity needed for high school. Moving from seventh grade directly to high school, the student may not have had enough time to develop the social skills necessary to navigate the new environment. High school can be a challenging transition socially, with larger class sizes, different peer groups, and increased academic expectations. It is important for students to have the necessary social skills to make friends, participate in group work, and establish positive relationships with teachers and classmates.