Agreed. My schools ranked 464th, and our Duxes always rank first in almost everything and stay in band 6ish marks the entire year, replicating that in their exam to get their mid 90's.
You have the same study program as one of my friends last year who got almost 90, so I think that a 90 still might be within reach. I'm still not sure exactly how much school rank affects your UAI, though. Ours is ranked 98.