Rick,
I took all three ICC electrical tests, residential, commercial and plan review and passed on the first try.
I didn't find them too difficult.
If you put forth the effort and study as you did on your contractors exam you should have no problem with these test.
Remember time management is the key.
If you need some study guides go to the icc campus web site there is some test prep material there.
GOOD LUCK, and THINK POSITIVE, you should be fine
Joe Villani