Hi imrisav,
Many Test Takers face pacing problems while dealing with either the Quant or Verbal section (or both), so you are not alone. Pacing problems do not exist on their own though - they're the results of OTHER problems. From what you describe, your studies have been 'book heavy' so far - and many Test Takers who use a book heavy study approach end up getting 'stuck' at a particular score level - so it's possible that this has happened to you as well.
Raising a 300 to a 700+ will be a challenging task - and will likely require at least another 3 months of consistent, guided study (and you will have to make significant improvements to how you handle BOTH the Quant and Verbal sections). Based on what you have described, you would likely find it beneficial to invest in a GMAT Course of some type (either Guided Self-Study or instructor-led), so you should plan to look into the available options. Most GMAT Companies offer some type of free materials (practice problems, Trial Accounts, videos, etc.) that you can use to 'test out' a product before you buy it. We have a variety of those resources at out site (
www.empowergmat.com). I suggest that you take advantage of all of them then choose the one that best matches your personality, timeline and budget.
If you have any additional question, then just let me know.
GMAT assassins aren't born, they're made,
Rich