I had disastrous experience in the last official gmat I took and other 2 wasn't any better.

Here are my scores of the official 3 gmat

Today
3rd official GMAT :
530 verbal: 20(29%) quats: 44 (69%)

oct 2008
2nd official GMAT :
550 verbal: 23(29%) quats: 43 (68%)

July 2008
1st official GMAT :
580 verbal: 24(35%) quats: 47 (81%)

Particularly, for my 3rd gmat exam I had prepared extensively for 6 months and I used to score on 630 on an average

my 6 MGMAT mgmat test for your reference


11/1/2009
MGMAT score 6: 660 verbal: 34 (72%) quats: 46 (79%)
Date: 9/22/2009
MGMAT score 5: 700 verbal: 40 (91%) quats: 45 (77%)
Date: 9/22/2009
MGMAT score 4: 570 verbal: 30 (59%) quats: 30 (57%)
8/30/2009
MGMAT score 3: 620 verbal: 33 (69%) quats: 42 (66%)

All essays were completed for the above MGMAT tets

The gmat prep test took just a week before the official test:

gmat prep 1: 570 verbal 25 quant: 42
gmat prep 1: 640 verbal 35 quant: 44

Can you please suggest me when I should take another gmat test? if i should have to, what is the optimal length to study, i don't know what is going wrong with my verbal, is there anything fundamentally wrong? if so how to correct it.

By taking the GMAT for 4th time, will it affect my application process anyhow. I'm feeling very low now. I hope your suggestions will help me to deal with my disastrous performance and lift my morale



Study materials used:
OG 11 & 10, MGMAT for verbal and Princeton