Can nursing students take STNA test without the classes?

Reading all the threads about jobs makes me realize I am not alone. I am one of the few of our nursing class that does not work as an aide or other job in healthcare. I have been applying to hospital positions and called nursing homes but they want a license as an STNA. How does one get the first job (aide, etc) when you don't have an STNA and can't get one because you are in school? All the entry level jobs even in LTC require you to have a license. Can you take the exam without the classes, since the content is covered in our nursing classes? Thanks!!