A 520 is a great baseline score, especially since you haven't begun studying yet.

While a 180-point increase in 5 to 7 weeks is rare, it's not impossible. My main reason for believing that you may be able to get 700+ in a short period is that Data Sufficiency (DS) questions typically have a steep learning curve. At first, they're totally confusing, but once you gain some familiarity with them, they're no harder than Problem Solving (PS) questions. Given that DS questions account for about 40% of the math questions, boosting your quant score from 27 to 40+ will hinge largely on your ability to become adept at DS questions.

If you're interested, we have a free set of videos that cover everything you need to know about DS questions: https://www.gmatprepnow.com/module/gmat-data-sufficiency

Cheers,
Brent

I too believe that increasing one's Verbal score is more difficult than increasing one's Quant score. Having said that, your baseline Verbal score is in the 69th percentile, so you're already quite accomplished in this area. Of the three Verbal topics, Sentence Correction has the greatest Return on Investment (ROI) when it comes to raising your score. So start there.

You had a LOT of time remaining, so that's very encouraging (most people run out of time). With some better time management, your score will definitely improve. If you're interested, we have a free time management video at https://www.gmatprepnow.com/module/gener ... es?id=1244

Cheers,
Brent

I agree that the SC section is a good place to start working on your verbal abilities. Of all the SC books that I've seen I liked the Manhattan GMAT SC book the most.

Good luck!