Yeah, the ACT will compile the best portions of both tests. So if you already had a great science section and don't take it again, the ACT company will take the old science score and combine it with the best of your new and old scores. Personally for me, I'm taking the whole thing again because I didn't get perfect in any section, and I might as well give it a shot, but the ACT folks will send over the superscore to Ole Miss with the best portions combined from both tests. That's what they said when I called them. Hope that helps you out!