...and make sure you know how your weapon functions. The last recert class there was a guy on the end with a brand new in the box auto of some sort (NIB? ...this was a recert class, what has he been carrying?) He failed the range because he could not adequately load and make ready his pistol.
As someone else mentioned, even if you wish to carry a revolver, I would try to qualify with an automatic. And it's not about how good you shoot, it's about being 'good enough,' and good enough is enough to pass. Pick a weapon you know and can shoot, even if it isn't the one you intend to carry.