GPA Improvement

I’m a high school Junior and I take 8 classes the whole year. Since Chicago Public Schools is terrible I don’t know my GPA. The last time I checked was the end of the first semester of Sophomore year and I had a 2.4. My grades were pretty bad but they improved exceptionally. My goal is to have a 3.5-3.8 GPA by the end of Junior year is that even possible? What’s the highest I could possibly get if I got straight A’s 2nd semester sophomore year and the Junior year? I also take 3 AP classes this year and I took one last year. All my other classes are honors and have been since freshman year but I know that doesn’t count towards unweighted GPA. Help!