And kudos, you are a rarity.
I would say yes. An LSAT prep course can push you up 3-10 points. Powerscore is pretty good. You will probably bump yourself up about 5 points just by reading a prep book like the powerscore or Manhattan LSAT. 15 points is a lot, but I've seen people jump 20 and even 30. And kudos, you are a rarity.