Who got the best grades in zinkoffs graduating class?

In Jerry Spinelli's novel "Loser," the character who receives the best grades in Zinkoff's graduating class is a girl named Missy. She is depicted as an academically gifted student, which contrasts with Zinkoff's more carefree and unconventional approach to school. Despite his struggles with traditional academic success, Zinkoff's character embodies traits of kindness and perseverance.