Thanks everyone, I passed

[bsilliman]

One thing that JeffReff forgot,
Get the rules down so you can see them in your sleep. You must be able to react to the plays, not think about what you saw and then blow the whistle--it is too late!
And finally, work as many games as you can; at any level. This will let you see more situations which don't happen a lot. But you will remember them when they re-appear again.
Good luck!