GMAT Verbal Section | Re: How to Improve Verbal from V30 to V40

2 days before i have given my gmat and scored Q50 V25.
The verbal score was terrible. I have been preparing for 3 months and still got the same verbal score as in my first diagnostic test on gmatprep.
I have already read every book of MGMAT and is a current student of e-gmat verbal course.
I have even done with official guides and powerscore too.
Now i don't know form where to start. I am a non-native speaker.
As i have read most of the books but still couldn't make it.
So can anybody suggest
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