Cumulative GPA is the Overall Graduate Average point in the entire stage of a specific major while the University or college divide them into semesters or years.This GPA is du … e to the result of ALL courses (Major and non-Major).n the cumulative GPA AP/Honor/Pre-ap classes are not weighted as harder classes. Therefore if i had an 89 in AP Chem, a regular chem student with a 90 would have a higher GPA … . In the weighted GPA, you're AP/Honor/Pre-ap classes are weighted. So that 89 would be considered a 109.