My best advice is that you should be boning up on your standards now before even getting there, just like your promotion board, drill it into your brain, do as much hands on as you can get a chance to do, use your battles as patients and examples left and right, the more it becomes second nature the easier it will come to you when it counts.
See if you can borrow some training aids from your BN/BDE S-3 to include some artillery simulators to prepare you for potential combat simulation during the EFMB, make sure you notify the MPs ahead of time before setting them off or you could have a whole different issue to deal with. Practice, practice, practice, and relax, don't over stress or you will cause yourself to forget or make stupid mistakes, relax and take it in stride and go with what you know.
Good luck.