GMAT Strategy

Dear All

First of all, thanks for sharing your gmat stratergy with everyone, it really helped many of us. I am in need of your help to score 740+. My gmat prep stratergy is as below.

I have completed Mahattan books, OG 10 verbal, OG 11 verbal.
Partially completed Kaplan books.
Studied ARCO Master the Gmat 2007 book, Gmat Nova.
700 q's in 1000 SC's, 50 RC q's in 3000 RC's.

I have created my own verbal notes. I have also recorded audio on erin's verbal notes and few other notes that i have collected in forums and i listen while i ride to/from office.

I have also done with my 2 month weekend class room study here in India, chennai.

Despite all these effort, i scored 620 in my first manhattan test and 560 in kaplan verbal test. Last night i tried power prep and scored 650, i am shattered by this score. I heard powerprep is easier than gmat prep, so my current level of scoring is close to 650. My exam is on 20th June, i have planned a 2 weeks vacation for my studies. After rejecting lot of internation offers and international trips these months for my gmat preparation, now its really disturbing me.

I couldnt really find my weak area in verbal because sometimes i score 80-90% in SC or in RC or in CR, and sometimes i score 50% in all these. I am doing fairly good in math.

I am confused, Should i continue with this rigorous study or can i convince myself with a score close to 700 in my real exam. Please advice.

Thanks.