The majority of the posts I read during my preparation period were about long-term study plans that people employed for this process. However, I feel that the number of posts about long-term study plans greatly outnumber those about last week strategies. Don't get me wrong. I think the aforementioned inequality is completely justified - there's no point in having a last week strategy unless you've prepared for the exam in a very thorough manner. Still, I believe I can provide more value to the readers of this forum by focusing on the methods I employed in the week leading up to my exam (given the fact that there's not as much guidance out there on this topic relative to others). The following is a list of things to do in the week leading up to your exam:
1) Go through all the mistakes you've made in the books and papers that you used to prepare. It's more important that you go through the mistakes you made in your papers if you're constrained for time. Solve these questions again and make sure that you can get answers for them (within reasonable time limits of course).
2) Don't go crazy solving papers everyday. Make sure you devote time to learning from the mistakes you've made and closing off the chinks that currently exist in your armor. I think doing 2-3 tests during the last week is more than enough, with the last CAT practice taking place either 2 or 3 days before the actual test. For last week practice tests, I would suggest either
MGMAT or GMATPrep.
3) Make sure you know exactly how to get to your test center. The last thing you need on the day of the test is anxiety about finding the center.
4) 24 hours prior: stop preparing! Take the last day off to relax. I'm sure you've read (and realized by now if you've given any full-length CAT practice tests) that sitting down for the GMAT is similar to running a marathon. You simply have to take some time to relax before attempting the test. Cramming to do a few a more math or verbal drills will probably not be helpful. It might just tire you out, or even worse, undermine your self-confidence right before the exam. This is a great segue for the fifth (and possibly most important) point.
5) STAY CALM AND CONFIDENT!! If you know you've put in the required amount of work to face the GMAT, and you've been getting scores in your practice tests that are within a reasonable range of your target score, there is no reason you shouldn't get the score you're aiming for on the GMAT. Getting freaked out on the day before will just derail you. So what do I suggest? Engage in activities that will keep your mind off the exam altogether. Watch a movie, go out for dinner with some friends, exercise etc. etc. Do whatever it takes to prevent yourself from thinking too much about the exam you're giving in ~24 hours.
6) On the day of the exam, try to reach the exam center ahead of time. I reached 30 minutes ahead of time. I spent my spare time listening to music to calm my nerves. If you've ever played a sport competitively, it might be helpful to repeat the ritual you engaged in prior to a game / match (similarly, if there's a ritual you've been following for all your practice tests and you feel it's been helpful, make sure you repeat it). You need to treat the 4-hour exam like any other competitive sporting experience. Make sure you're carrying some snacks and beverages in case you get hungry or thirsty during the breaks.
That's pretty much it. Apologies if parts of my post are not completely clear. It's 4 am here but I promised myself that I would get this post done before the Monday following my exam.
Best of luck, everyone!! I really hope this helps!