Probably the most it will do is give you a leg-up on the job search
. Your work experience as a CNA will let potential employers
know that you're comfortable giving patient care in a medical environment. It'll also (I'm told) make that first nursing class (mine is called Fundamentals of Nursing) a little easier, since you will be used to touching/changing/bathing patients already.
It will not give you credit for any classes or allow you to skip any coursework.