Timed Subnetting Practice Test?

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Alright, I've put it off long enough, I'm about to try for my CCNA next
month.  I'm pretty good at subnetting, but I want to know just how
good.  Is there anywhere out there that has some practice subnetting
questions that either time you or actually tell you how long each
question should take to answer in order to have a passing chance with
the CCNA?  There's plenty of examples in my books, but those obviously
aren't timed, and I have no idea if I'm completing them fast enough.

Thanks in advance.

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