Please answer a question about the following article about Madonna (entertainer):

In 1966, Tony married the family's housekeeper Joan Gustafson; they had two children, Jennifer (born 1967) and Mario (born 1968). At this point, Madonna started to resent him for decades, and developed a rebellious attitude. She attended St. Frederick's and St. Andrew's Catholic Elementary Schools, and West Middle School. Madonna was known for her high grade point average, and achieved notoriety for her unconventional behavior. She would perform cartwheels and handstands in the hallways between classes, dangle by her knees from the monkey bars during recess, and pull up her skirt during classall so that the boys could see her underwear.

Madonna achieved a name for herself in school by her unusual behavior and also for what other reason?
high grade point average