What does the woman suggest about Carlo's geometry skills?

The woman suggests that Carlo could benefit from private lessons, indicating that he may require additional support to improve his geometry skills. This implies that despite his current level of understanding, he still has potential for growth and that personalized instruction could help him grasp the concepts better. This choice emphasizes the idea that tailored teaching methods designed to address his specific challenges in geometry could enhance his learning experience, leading to improved performance.

The context of the conversation likely points to a recognition that while Carlo may have some understanding of the subject, structured and individual attention through private lessons could make a significant difference in his mastery of the material.