All you need is PRACTICE

My first attempt at the mock exam of GMAT gave me a 520. It was disheartening. More so because these were not questions that I did not know the answers to. It was only time that was a constraint.
I buckled up and looked at the verbal section which was a little weak comparatively. I required in depth analysis of where I was struggling. I was recommended e-gmat by a friend. I started preparing from the Scholarium on the verbal section. Within no time I started improving. I identified my eak areas and started working on them. In my first actual GMAT attemept I scored a 690 within 2 months of online practice from the e-GMAT scholarium.
Hope this helps!