Without knowing your section breakdowns its hard to give you an accurate estimate, but if you're scoring 9's on the sections, and were looking to score 10's on the sections, you're talking about an improvement of roughly 3-4 raw score points (extra questions correct).
This kind of an improvement can come from studying more/harder, but can also come from consistency. I bet if you look at your AAMC score reports, you'll notice that sometimes you get topic A questions right, and sometimes you don't. Well just by making sure that always get topic A questions right, you won't necessarily have to learn a new topic, topic B, in order to get those extra 3 questions right in each section.
Good luck.