In addition to the excellent advice already given, I would like to emphasize LaRue’s brief suggestion to take practice tests. Make the practice test environment just like the ACSM exam you’ll take. This includes making sure you put the same time limits on the practice test as will be on the actual certification exam.
Good luck! Perhaps one of the most important considerations is that you approach the exam with the confidence that you know the material, rather than being uncertain and fearful that you aren’t prepared. It seems that you’ve prepared very well.