I would download the GMATprep software from
https://www.gmac.com and this will show you everything that is tested and how they are tested. I would learn how Data Sufficiency works on the quant section, otherwise you will have no idea how to do those. I would take all the practice questions on that software to show you what every question type can look like.
If you have time, or think it would be useful, I would recommend taking the GMATprep practice test. Will take about 3.5 hours if you skip the essays, but this will be the best estimate of what you can expect on test day. This will also show you the timing. I would go through your mistakes right away, and see if you can learn any info from that. If you are far away from your target, you are definitely in trouble, and I would recommend pushing your test back to the last possible moment, finishing the rest of your application, and studying your a** off. If you take the test and blow it, you won't be able to take it again for 30+ days, and this might put you out of the running.
Just remember, for business programs, the most important side of the test is quant score, but the verbal can really help drive your overall score. You may or may not be in trouble, depends on your starting point. I personally scored a 570 without a single second of studying b/c my verbal pulled me through. With about two weeks of studying I was at a 600, and with out 4 I was at a 640, and so on... but since you are on a short time frame, I would really try to familiarize yourself with the question types, timing of each section/problem, and how the test looks... Download that software asap
Good luck and let us know how it goes!