I am taking the September LSAT and have recently been hitting some extremely high scores, and my question is basically as it says on the tin, what can I do to ensure that these scores hold to test day? What sort of study methods should be used as regards maintenance and atrophy prevention?

As it says on the box cover really, I'm mostly concerned regarding the endurance difference that comes from taking a 4 vs. 5 section LSAT. I've essentially been building up endurance using 4 sections up till now, with the intent of switching to 5 section LSATs from here on. What kind of score fluctuations and endurance differences should I expect?