It appears that the referee test is now available. Go forth and certify, refs! 
Wow. Much more detailed this year. I saw 3 hours and thought: 3 hour test? Much of that was doing the training. I only took forever on the test because they only give you 2 chances to pass it.
Yeah, same thing. I passed first try, but barely (I got 4 wrong). Some were my fault, some I thought were bad/incomplete questions. But oh well, I passed it! I took forever on the test, though.
Puts most of the drive team tests I see here on CD to shame, though (as it should, refs should be expected to have a deeper knowledge of the game)