Wouldn't we all love a simple answer to that question! That's tricky, as that jump on a percentile basis takes you from the 77th percentile to about the 90th percentile - that's that leap that many, many people in the "well above average" category are trying to make to join the "very elite." So it's competitive there and that jump doesn't have an easy to-do list.
The best course of action at this point is to take an official GMAT Prep practice test or to return to one you've recently taken and really analyze your performance. Which problems SHOULD you have gotten correct but didn't because of silly mistakes or a lack of knowledge on something you really should know? Those you MUST get right next time in order to make that leap. Which problems COULD you get right with a healthy amount of study to better understand those concepts or to hone your approach so that you're more efficient? Those are items you need to prioritize over the next few weeks. And what can you learn about your time management? If you wasted valuable time on problems that you know you were destined to get wrong anyway, could you better allocate that time to double-check your work where you made silly mistakes? Or would that save you from rushing/guessing toward the end?