OG11/12 are good only for practice..and from what i have read on the net, OG books contain very few 700+ level questions. So, if you are aiming for mid and high 700 score, i am nt sure which book u need to follow (Do let me know if u find one). My opinion is- If one goes thru the basic stuff and approach the questions in OG 11/12, OG Verbal guide and Quant guide in the right manner, 700+ is attainable without much fuss
PowerPrep S/W- u get 2 free GMAT tests from GMAC- these can be dowloaded from www.mba.com
SC- go for Manhattan SC
CR- PowerScore CR or Manahattan CR
For RC and Quant, u can check the Manhattan GMAT books or the regular CAT material or Kaplan premiere
What kind of information can be expected from the ISB info session?