Does anyone know and willing to answer my question please?

It's not allowed to be challenged in TN.
If you are already a CNA, you can transfer your registration with the TN BON.

I am not sure what you mean by challenging the exam. If you mean not taking it at all, then no. If you are a CNA in another state, you can usually transfer your license. If you are in nursing school and have completed a course in Fundamentals, then the state will issue you a challenge letter and you can take the test without actually taking the CNA classes. If you have medic experience in the military, the state will also issue you a challenge letter, again so you can just go take the test without taking the classes.

If you're already a CNA TN does not accept certification from GA I know for sure. But GA accepts TN certification. My instructor in the class that I finished for my CNA went over that with us.

oh. also I do know that TN is more strict than GA so maybe you can there.