Thanks for everyone's advice. I took the GMAT for the second time recently and it looks like I need to take it a third. I've taken the Kaplan live course and I think I may have maxed out there. I'm thinking of trying the Manhattan Quant section, what do people think about that course? I've heard good things mostly and that it's pretty challenging.
For reference, I got a 620 (45Q/30V) on the first GMAT, and a 640 (39Q/38V) on the second one. Since I took the first test, I have gotten 47, 44, 49, 49, and 41 in the quant practice tests through Kaplan. I have "broken through" on verbal and have been doing well on those. I don't know what happened on quant during the test - I think I got nervous after seeing the first few questions and not knowing the shortcut right away on them. I also spent too much time during the middle 12 questions.
I'm feeling pretty hopeful about the next test, all I think I need to really focus on is quant. I'm still going to stay fresh on verbal stuff, but I need to get more consistent with quant. Any advice on what to do? Do people think Manhattan is the way to go?