Sorry I couldn't type Chinese now but here is what happened last year at my school district. Our high school is a top public school in the area and every year there are several who counld make into the ivys. Last year the GPA #1 kid was an Indian boy who was doing the GPA trick as you described. He was very smart and very competative in college application process. Everyone though he would ended in one of the ivys. However, he got rejected/defered from all top 10 in his early and regualr application and ended up in Georgia Tech. Everybody knew he did the trick was guessing that AO questioned his curriculum as he choose college courses rather than AP offered at the school. Obviously there is something there when you choose to do a lot of such courses outside of your own school.
Just FYI.