I did poorly in High School, and my sat's weren't so great, but I took the hardest courses offered at my school. Now I'm a freshman at Norwich, and I maintained a 3.9 gpa as an accounting major for the first semester. Do I still have a chance for the Academy?
Also how competitive are you as an applicant if you come from a senior military college like VMI, The Citadel, Norwich?
The question is what courses you're taking at Norwich. If you've taken Calc, Chem, English, History, and other math/science courses and have a 3.9, you will be in good shape. If you haven't taken the above courses (esp the Calc and Chem), not sure how much it will help. USNA wants to see candidates in post-h.s. programs take the plebe courseload to the greatest extent possible.
Candidates from post-h.s., programs are viewed favorably because they have additional maturity, experience, etc. That said, I don't know anyone who came from Citadel or VMI. TYPICALLY (and there are exceptions!!) people attend one of those schools for the tradition and/or because the academic requirements aren't as stringent as the traditional SAs.
How competitive you are depends on your courses, grades, activities, sports and leadership -- not unlike a h.s. student. You just have another year in which to excel.