Good, now we have some data that we can use to figure out what to do.
Your goal is to increase your score by about 150 points. That is a significant goal and it is likely that you will need several months, at least, in order to have a chance to make that kind of improvement. The exact length of time it might take is obviously different for different people.
So we have two big "stages" here. First, you were scoring higher in verbal on your practice tests for certain reasons, and we need to fix those reasons so that you would be able to get that same score on a real test. Second, though, your practice test scores weren't as high as you'd like to score on the real test, so some of the improvement will have to come from improving your current level.
Running out of time at the end of a section causes you to lots of questions wrong in a row. That hurts your score very much, so we need to fix the timing problem.
Normally, I can not answer the verbal question quickly. But if I have time, I can answer correctly.
The first thing to understand is that you will NEVER have time to answer all of the questions on the real test, because however good you get, the test will always give you something harder. Sometimes, you will have to guess. And, if you are going to guess, you want to guess BEFORE you run out of time on the question, not after. So part of your task is to figure out when the test gives you something that you cannot do - and narrow down your answers to make a guess without spending any
extra time on that problem.
So, you need a plan. You need to read a series of articles (linked below) to develop that plan.
First, you need to understand better how this test works. Log into your MGMAT student center and look for the free e-book The GMAT Uncovered. (Anyone who signs up for a free test with us or creates an account with us for any other reason will receive a free copy of this e-book in his/her account.) Read this book thoroughly, especially the sessions discussing how the test works.
You should also read this article about time management:
http://www.beatthegmat.com/mba/2009/12/22/critical-skill-development-time-managementNext, you need to develop a study plan that is targeted to your strengths and weaknesses:
http://www.beatthegmat.com/mba/2010/02/09/developing-a-study-plan(Note: you will need to decide whether to study on your own or whether to seek outside help in the form of a class or tutor. There are positives and negatives to both approaches; you'll have to decide what is best for you.)
The study plan article, above, has links to two other articles that you should read after you read the study plan article. I'm not going to link to them here; go read the study plan article first and then click on the links in that article. (One is about how to evaluate your strengths and weaknesses and the other is about how to study practice problems.)
Speaking of studying practice problems, you mentioned this:
[url]I run out of my practice questions and now I do not know what to do in order to understand better verbal section and answer quickly.[/url]
You have NOT run out of practice questions, actually! You aren't done with that material yet because you haven't learned what you needed to learn from those problems in order to score a 680. You don't learn from merely
doing the practice problems. You learn from
studying and analyzing the practice problems. So you still have a LOT you can learn from those problems (and that article I mentioned above will help you learn how to do this).
(I have sometimes studied a single problem for 20 or 30 minutes before I'm done with it! It's typical for me to spend 5 to 10 minutes analyzing any problem, even the ones I get right easily.)
Here are a couple of other articles that might be useful for you:
How to learn from your errors:
http://www.beatthegmat.com/mba/2010/04/07/how-to-learn-from-your-errorsHow to read an RC passage:
http://www.beatthegmat.com/mba/2010/04/23/how-to-read-a-reading-comp-passageAnd here are two on stress management; try out the suggestions to see what might work best for you:
http://www.manhattangmat.com/stress-tips.cfmhttp://www.manhattangmat.com/strategy-series-stress.cfmHere's the full archive of articles; once you've done the above, you can browse these to look for more articles that can help you based upon your specific strengths and weaknesses:
http://www.beatthegmat.com/mba/manhattan-gmatGood luck - after you've developed your study plan, come back here and let us know what you've come up with.