Which materials have you used and what are your current practice scores thus far?
A really effective approach to studying verbal within a short period of time is to target your weakest area first. Manhattan SC is a good resource for sentence correction.
I've heard good reviews about Powerscore's Critical Reasoning Bible, if that is the area where you need the most improvement.
Also, we've recently released The GMAT Bootcamp Study Guide. This is a great resource that is designed to provide a comprehensive review within a one month period.
If you haven't already, take a look at the GMAT Pill Study Method. It's dedicated to helping you prep in as little time as possible. But don't take my word for it--look at it yourself and see if it fits your learning style.
Students find the Verbal Combo Pill Package particularly helpful in sentence correction and critical reasoning.
Hope that helps. Feel free to message me privately ([email protected]) for additional guidance or questions.