allow enough time on saturday morning to eat breakfast and get ready and everything without rushing. i would get to the test center SUPER early (like, an hour early) and sit in the car while youre waiting and do some practice questions (more on this in the next paragraph) and then just relax.
practice questions: i found that when i took a test first thing in the morning, my first section was the worst because i was still warming up my brain. so then i started doing a page or so of practice LR questions just to warm up, and my score instantly shot up to what it was when i took evening practice tests. the day of the real test, i took a games section at home before leaving. games were my best and favorite section, and i did the one from the blind diagnostic. i got a perfect score, so it pumped up my confidence. i drove to the test site and did some LR questions in the car, ones that i had already seen but i covered up the answer choice letters and ran through reasoning in my head.
what i wish i had done: one or two reading comp passages. since i hadnt done reading comp in two days at that point, it would have helped me pace better. what i suggest: do one or two reading comp passages that you havent already done, BUT dont look at the correct answers afterwards. if you get some wrong, you might get frustrated and go in with lower confidence. and you probably wont learn anything new at that point. just get your mind back in the 8:45 reading comp track. if i had done that, i think my score could have been 1 or 2 points higher. my first section was reading comp, and part of my problem was that i didnt pace myself well and finished just in time, whereas i had usually been finishing with several minutes to spare, which i used to review my answers once more.