Question on Rude Kids

This is from Julia:
Ben,
First question after trying this for a week.
I have kids saying they already know this stuff. But I have many kids who are getting it deep down for the first time since taking it since kindergarten.
What do I do with the complainers? They don’t actually know it. They can do it on paper is all. They cannot speak Spanish without hesitation and they cannot speak it / write accurately.
Advice?