Can I still graduate with a 3.75 gpa?

Janet
I did good semester 1 of freshman year in highschool with a 3.5 gpa. Second semester it was a 2.8 and first semester of sophomore year it was a 2.8 again but second semester it was a 3.2. If I were to get a 4.0 gpa the next two years of highschool can I graduate with a 3.75? By cumulative how do far is a 2.8