Help to start GMAT preparation! (Want to aim for 700-750)

Hi, I am John S A from Bangalore. I have 4.5 yrs experience in IT industry as of now. I really dream of going for an E-MBA in 2010 and am mainly looking for ISB. And I wish to give the GMAT by June 2009. I have bought Official Guide 11th Ed. And I have some online tests software also with me. To hin...