CNA Certification in Jeopardy PART 2

So I called the school where I took my CNA classes at and Prometric where you get registered and asked about the abandonment thing. Turns out if I refuse to stay on a day that they mandate me when I have school I will get turned into the state for abandonment and will never be able to work in the medical field again. Doesn't matter that I had an agreement with the previous management that hired me in, doesn't matter that I have a legit excuse and I go to school. They advised me to write a professional letter stating that I cannot stay under those conditions and cannot jeopardize my education, and that if they were unwilling to accomodate my schedule and put it in writing that they would not mandate me on school days then to tell them I was putting in my 2 weeks notice of resignation. That way if they said they would accomodate my schedule and I got that in writing, that if they fired me in the future for refusal to stay for mandation and they tried to flag my certification, then I could fight it in court. I went and filled out some apps today at places that do not mandate-they use agencies when people call in. Are nursing homes and hospitals this way too? If so then I better just find a job that doesn't mandate until I get out of college.