GMAT Verbal & Essays

HI!
I am planning to Write my GMAT in December . Its been almost 3 months since i started my preparation for the exam. Recently i started writing Mock Test. I was not able to score much in mock test . I only score in the range of 550-580, I was able to score 47 around in Math and only 14-20 in verbal.
When i analyze the test i realized that i was doing very silly mistakes during the test in math section particularly and by the time i reach the verbal section i become so tired that i was not able to concentrate on the question at all.

When I do the same question i practice session i able to answer it correctly but in a single sitting of 3 hour i am not able to perform that well.
I am really confused How to increase my ability to concentrate for long hours. I Really need your Help, Please suggest me some thing so that i can concentrate constantly for 3 hours
Its like just when 2 hours complete i am almost done. I am not able to anything to my score
With me its like Maximum marks in first hour, Less marks in second hour and least marks in last hour........
and i am very bad in verbal so its becomes worse for me ,

Please Suggest me what to do. I really want to score Good....
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You can only build it brick by brick. Try to have long practice sessions. Target uninterrupted 1 hr study session initially, then raise it to 2 hrs / 3 hrs and 4 hrs. Once you can study uninterrupted for 4 hrs, you are well on your way to solve this problem.

An importance advice:
Disconnect from Internet during practice sessions. This is a huge concentration breaker.

niksworth wrote:You can only build it brick by brick. Try to have long practice sessions. Target uninterrupted 1 hr study session initially, then raise it to 2 hrs / 3 hrs and 4 hrs. Once you can study uninterrupted for 4 hrs, you are well on your way to solve this problem.

An importance advice:
Disconnect from Internet during practice sessions. This is a huge concentration breaker.

lol.. yup

goyalsau,
I feel you should also take more mock GMAT tests. There are a lot of free tests available (check the 'Free GMAT Prep Resources' box on the BTG homepage) and trying those will help you build your mental stamina. Also, complete the AWA questions in the mock tests as it'll give you a better sense of how mentally exhausted you will actually be
The fact is that you will be tired by the time you reach the last few questions in Verbal; concentrating for more than 3 hours is stressful. So try and build on that stamina and, as niksworth said, study for longer uninterrupted hours with no distractions and no long breaks.

All the best!

What really helped me was the way I structured my studying. When you are doing practice problems, completely disconnect from everything and do problems for 75 minutes straight. Once you have finished as many problems as you can in that time, go back and check your answers.

This will help you build up the stamina.