Hi Luigi,
To answer your initial question: NO - the GMAT2016
OG is not outdated. All of the material in that book is still great practice material. However, considering your score goal, you will almost certainly need more than just a few books to get to that level. A 700 is approximately the 90th percentile, meaning that 90% of Test Takers never score that high (regardless of how long they study or the number of times they take the GMAT). Thus, you're going to have to put in some significant effort to get to that level - and you'll need to learn the proper knowledge and Tactics. Many Test Takers also spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so you might need more study time than you've planned for.
Since it sounds like you're just beginning your studies, then it would be a good idea to take a FULL-LENGTH practice CAT Test; you can download 2 for free from
www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can familiarize yourself with the basic content and question types, then that's okay - but you shouldn't wait too long to take that initial CAT. That score will give us a good sense of your natural strengths and weaknesses and will help provide a basis for comparison as you continue to study. A FULL CAT takes about 4 hours to complete, so make sure that you've set aside enough time to take it in one sitting. Once you have those scores, you should report back here and we can come up with a study plan.
I'd like to know a bit more about your timeline and goals:
1) When are you planning to apply to Business School?
2) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich