Hi sgcfivegm,
Many Test Takers use a variety of resources during their studies (practice questions, OGs, CATs, Courses, tutoring, etc.) so limiting yourself to JUST practice questions might not be the best plan. Your particular 'needs' will vary depending on yours skills, score goal and timeline though, so it might help to provide a bit more information about the work you've done so far and your goals:
1) How long have you been studying?
2) What materials have you use so far?
3) What is your goal score?
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich