Four weeks 'til the GMAT !

Booked my GMAT exam in this morning - scheduled for July 16th. Four weeks to study - need to brush up on some long words, write a few essays, and pull out those old maths textbooks. Seriously, I'm really excited. I've been wanting to do this for a while, but work and travel keep getting in the way. A lot of the work that I was going to be doing in July has been moved back a month, so I should hopefully have the time and energy to put in a decent effort. Any study advice out there?