Hi Tim,
There are a variety of different ways to prepare for the GMAT and a LOT of different study materials, so you should think about how YOU best study/learn and look for resources that match your personality.
With a June 25th Test Date, you've given yourself plenty of time to study, which is good. The tentative plan you've laid out follows an "All Quant, then All Verbal" format and that type of organization doesn't necessarily yield the best results. You might find it more useful to 'mix' a bit of Quant and Verbal practice into each week of your studies. You'll also want to take FULL-LENGTH CAT Tests on a regular basis (1 CAT every 2 weeks or so to start, then 1/week as you get closer to Test Day).
1) What is your goal score?
2) When are you planning to apply to Business School?
Since you're just beginning, 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 bit of practice first, so that you can familiarize yourself with the general content and question types first, then that's fine - but you shouldn't wait too long to take that initial CAT. 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.
GMAT assassins aren't born, they're made,
Rich