Hi gl7.
You have some good answers already, so I just want to add a couple points.
While taking a full mock the day before your actual test might leave you a little drained on test day, definitely you should keep practicing the day before your test to stay in game mode. There is a certain mindset in which one has to be in order to score high on the GMAT, and by taking a day off you wouldn't be doing your best to stay in that mindset.
Further, to be in GMAT mode on test day, warm up before you take the test, either before you go to the test center, or when you arrive at the test center but before you enter. Remember, you WILL NOT be allowed to take prep materials into the test center. So, don't show up with prep materials. Either warm up at home, warm up by answering questions on your phone, or make sure that you have a place to store prep materials outside the test center when you are at the location of the test center. When you warm up on test day, do practice questions until you feel alert and on point.
Now, regarding the AWA, it's pretty easy to get a decent score on it. So, you could leave it for last, and then do your best to write a decent essay. Here's how to score well on the AWA by preparing for under an hour.
Go find an AWA template. There are plenty online. You will use the same template no matter what AWA topic you see, probably a four or five paragraph template. Then do the following to practice. Spend some time with the AWA topics here,
https://www.mba.com/~/media/Files/mba2/ ... t-exam.pdf, for each topic considering how you would fill in the paragraphs in your template. That should do it. Then when you take the test, just bang out an essay that fits your template - such as, intro, supporting paragraph, supporting paragraph, supporting paragraph, conclusion.
May your test go well. Remember to stay cool and focus on the question in front of you. The GMAT is a cool game. Enjoy it and make your score happen.