Hi Meriwether,

That's a hard question to answer with any precision, since improvement depends on so many factors. But that's a very reasonable increase, and you can probably do most of the heavy lifting on your own. What prep materials have you used so far? Almost any course is going to raise your score somewhat, but you might want to spend a couple weeks studying on your own, then see where your score is at before making the decision.

That said, if you do choose a course, just make sure it's with a reputable company such as Veritas Prep or MGMAT. For that much money, you should definitely be getting a high standard of teacher!