Hi jsandroid,
Since you're coming back to the GMAT after 6 years, it would be a good idea to take a FULL-LENGTH practice CAT Test; you can download 2 for free from
https://www.mba.com (and they come with some additional practice materials). If you want to do a little studying first, so that you can refamiliarize 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.
Yesterday, GMAC announced that some changes are going to be made to the format of the Exam - there's a discussion thread about that here:
https://gmatclub.com/forum/gmat-is-chan ... 62569.htmlSince some of the specifics are not yet known, it's going to take a bit of time for all of the available practice resources (including the available practice CATs) to reflect these changes to the Exam. Thus, while the question types, content tested and Tactics will all be the same, everyone's probably going to need some time to properly adjust to the new format and 'feel' of the Exam.
I'd like to know a bit more about your timeline and goals:
1) What is your goal score?
2) What is the application deadline for the PhD Program you're interested in? Are you applying to more than one Program?
3) Is there a particular reason why you're trying to limit your studies to just 8 weeks?
GMAT assassins aren't born, they're made,
Rich