The student becomes more able to ask questions about what they need to know.
Students develop a stronger relationship with their peers.
They are interested in each other s learning. Oftentimes stronger students mathematically become concerned about the well-being of the weaker students in the group. They learn that different people have different strengths and contributions. I have seen students who shifted roles from class clown to a group motivator. I have noticed with other people, their ability to work with others and be more vocal about their thoughts improve.