Hi Flang23,
It sounds like you're just starting out. Is that true? Have you done any studying so far?
If you're just beginning, then 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 and we can come up with a study plan.
I'd like to know a bit more about your timeline and goals:
1) What is your goal score?
2) When are you planning to take the GMAT?
3) When are you planning to apply to Business School?
"Review" is an important part of the GMAT training process, so you should absolutely expect to review concepts, prior practice questions, etc. throughout your studies. Certain types of review should be done in the short term (for example, if you get a question wrong because of a silly/little mistake, then you should redo the question step-by-step). Other types of review should be done later on (for example, if you have not learned all the Geometry rules yet, you shouldn't focus on learning any individual rules until you're working through a broader set of practice Geometry concepts/prompts).
GMAT assassins aren't born, they're made,
Rich