If your target score is in the mid 600s or higher, you may want to push back your GMAT since increasing your score by 60 points or more will likely take more than a week.
That said, you may be able to increase your score fairly quickly if you can get Verbal to click for you since, once you basically get how to handle Verbal questions, you'll likely make fairly fast progress in Verbal.
The fastest way to get better at Verbal is probably to work with a tutor who can help you to understand what works for answering Verbal questions and why it works.
For insights into how to prepare for Verbal, and to an extent DI, effectively, see this post.
How to Prepare for GMAT Verbal