730!!! 100 point increase with Economist Test Prep

When I took the GMAT the first time, I received (in my opinion) are pretty good score - 630. However, within that 630 my breakdown was extremely uneven; I didn't do well in the Quant section (36th percentile) but I did well in the Verbal (85th percentile). I was unsure whether or not to take the GMA...