Hello,
LukeofMass. I agree with what has been written above. If you are talking about the official practice exams, then only the first two are free. You can reset those as many times as you want, and there is value in retaking them. Tests 3-6 can be purchased, but once you have taken them, you get a single reset, since the question pool is much smaller.
You ought to consider utilizing the
Practice Question Banks to access as many questions as you could hope for. It would be a mistake to prepare for the exam by using mock tests exclusively, even though you never said you were doing so. Mocks are simply a way to gauge your progress at certain times as a break from the day-to-day prep work you are putting in.
I am all about maximizing preparation on a tight budget. I am convinced that with persistence, you can earn your best score, free of charge, by dipping generously into what this site has to offer: official questions, top-notch responses from the community and Experts, even video tutorials (such as the
GMATNinja Verbal series).
Good luck with your studies.
- Andrew