Hi Infamous,
The first thing to note is that finishing early in a section is NOT a good thing. Since you finished 10-15 minutes early in BOTH the Quant and Verbal sections, you likely rushed through a number of questions that you COULD have gotten correct, but didn't. So, my first bit of advice is to slow down, take more notes, do more work, etc.
Since you don't have time to master all of the content on the GMAT, you have to pick a few "big" categories and focus on those. In the Quant section, you're going to see a lot of Algebra and Arithmetic and you'll see lots of DS questions, so spending some time on those categories would make sense. There is no "small" category in the Verbal - you'll probably see slightly more SCs and slightly fewer CRs, but you'll still see lots of all 3 categories (SC, RC and CR).
You should work on practice problems for at least a few days before you take your next CAT. On that CAT, your goal should be to quickly dump any question that you clearly have no idea how to solve, and spend your time on ANY question that you can reasonably answer. Picking up points will require REAL work on your part - NOT chin-rubbing and staring at the screen.
GMAT assassins aren't born, they're made,
Rich