yes I didn’t know either, but if you take ap courses it can get you above 4.0.
Honors course can be .5 or 1.0 weighted up and AP Courses are 1.0 weighted up. This is standard for most high schools now.
So if you get an A in AP World History it is a 5.0.
A- in Honors Chemistry it is a 4.2 or something like that.
SO if you have a 3.75 GPA.... it might not be as good as one thinks. This is the main reason schools have done away with rankings because a good GPA still can be in top 20% not top 10%. Crazy since we were in high school.