The GPAs they calculate at AADSAS are:
1) Biology,
2) Chemistry,
3) Physics,
4) BCP (Bio, Chem, and Physics combined)
5) Science
6) Non-science
7) Cumulative
They calculate all aspects of your GPA to see where your strengths and weaknesses are, I believe.
You're right that your cumulative should be the same as your transcript from school. If you've taken summer classes at another school, those grades are figured into your GPAs too.
I'm pretty sure that upper level science classes count towards your science GPA. I think Math classes also count towards your science GPA (I'm not sure).
I hope that answered your question 🙂