OG needs to be your bible, but under stress, you might find you might perform differently.

You have time (which is great) so I'd recommend the following (for starters).

> Do 3 diagnostic tests (paper GMAT) and isolate your strengths and weaknesses
> Sign up for a subscription online course (we have one for clients and friends) that has MANY questions and allows you to bank your questions. Make sure they are GREAT quality and don't just give you busy work...
> Practice - - and make sure you understand WHY this math is important...it's all a metphor of how you'd be as a business person, more than testing your on basic math (ok, they test you on SOME basic math).

Finally: be sure you're psychologically prepared for the test - - that you feel prepped and primed to perform your best. Zero anxiety. Zero Stress.

Good Luck!