I scored 760 [Q47, V48, IR8] after a month and a half of fairly light study. It was my first time writing. I did all of the practice problems in the quantitative and sentence correction sections of the Official GMAT Guide. I did not write one practice exam, and I only practiced a handful of reading comp and reasoning questions. I did no IR or essay practice either.

My rational was that math and grammar are the only things I realistically improve in a month. Writing, reading, and reasoning are developed over many years. I'm pretty happy with my score, but the quantitative is a little low considering I'm a math/econ major.

I feel like the verbal score is a more accurate reflection of ability, because it doesn't bog you down in incredibly tedious calculations. I could have answered any of those math questions, but the more I got right, the more ridiculous they became in terms of calculation, and I had to guess to get rid of the question so I wouldn't run out of time. It's not like it takes any brains to deal with a bunch of decimals and exponents, but the tediousness of it when you get 2 mins per question is dumb.