Like I said, I can only speak for Canada here, but as I understand it, you grade in class so to speak, up until 2nd kyu, and from there (at 1st kyu) you take a more official test.
Again, even if your Sensei has a thick accent, it is best to speak to her about this, so that you can find out the specifics of your federations protocol. Or you can tell us what federation you belong to.
--Chris
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"Seek not to follow in the footsteps of the men of old; seek what they sought."
--Basho