GMAT faliure..suggestion needed to retake or apply with same

Hello,

I am a member since 2007, however did not utilize this forum at my best. Now I think I am sure your help seriously ! I have already taken GMAT 4 times.

1st in 2007 : 560 (Q-48, V-19) (Not valid now!)
2nd in 2010 : 570 (Q-48, V-19)
3rd in Sep’12 : 610 (Q-48, V-25)
4th in 5th Jul’13 : 570 (Q 47, V-21) (I thought of retaking for the last time to increase my score 650+ but miserably failed

Last few month I have been preparing for the last time ( ) thinking that I would surely get 650+. Unfortunately I ended up with the horrible 570 once again. I am now afraid of retaking. I am really blank on my scores. This time I prepared for almost 2.5 months on regular basis and last 2 weeks almost 10 hours a day. My scores in various CATs were as follows.

MGMAT-1 : 520: Q-42, V-20 (1st attempt) 590: Q-45, V-27 (2nd attempt)
MGMAT-2 : 650: Q-41, V-37 (1st attempt) 600: Q-47, V-27 (2nd attempt)
MGMAT-3 : 570: Q-40, V-29 (1st attempt) 660: Q-45, V-35 (2nd attempt)
MGMAT-4 : 610: Q-45, V-30 (1st attempt) 570: Q-42, V-27 (2nd attempt)
MGMAT-5 : 630: Q-39, V-37 (1st attempt) 670: Q-45, V-36 (2nd attempt)
MGMAT-6 : 580: Q-42, V-28 (1st attempt) 670: Q-46, V-35 (2nd attempt)

GMAT Practice Test-1 : 590: Q-48, V-21 (1st attempt) 670: Q-50, V-28 (2nd attempt)
GMAT Practice Test-2 : 610: Q-48, V-25 (1st attempt) 710: Q-50, V-35 (2nd attempt)

I also took Kaplan test but could managed consistently 580-610 in all 4 tests.

Now I am in a serious problem.. and trying to introspect whether I SHOULD retake?? I know my Verbal is very weak, but last few CATs I was getting average 30+, hence I thought its has improve a bit. But after retaking real GMAT finally on 5th July, it seems my status is same. Request Your suggestion on the following :

1) It is advisable to retake GMAT for 5th time?
2) Can I apply with this scores only? I am targeting Indian B schools (ISB, IIMs), Singapore (NUS, INSEAD & Nanyang), Hong Kong (HKUST & CEIBS) and CANADA (Schulich & Rotman). My brief profile given below.
3) If I need to improve my score to 700+, then what I am supposed to do and how?


My brief profile is:

10th : 80%
10+2 : 70%
B.Tech. : 74% (From NITs)
Total Work Exp. : 8+ Years in Manufacturing / automotive industry.
Current Org. : Working as manager with TATA Motors in Strategic & Business Planning.
Field of work : Project management, Planning & Budgeting.
International Exposure: Visited Thailand, Belgium & Netherlands for work purpose ( Total ~ 2 months)

Request your kind help .

Regards,

Prabhat