What would be core subjects?
The OP implied that that her daughter and the others did six subjects the same but her daughter did an extra. If core subjects to be anything that isn't an elective. English, maths, science, second language if required.
By this definition the GPA for core classes wouldn't accomplish what I think the original poster was suggesting. Foreign language wouldn't be included nor any math after Geometry. The label our H.S. uses is 'Academic GPA'. Academic is any class that is approved for college entrance at the state university systems. Thus for us PE wouldn't be included and some art, music classes are included while other are not.
Many university calculate their own GPA for entrance weighting and counting only the classes they are interested. So this is not really as much a factor for college entrance as it is for some invisible ranking.
