You don’t go to medical school to become a nursing assistant. You can take a nursing assistant course at a community college to become a CNA…certified nursing assistant.
I will say, some folks do this, and then work as a CNA, and complete their four year degree, taking the prerequisite courses to apply to medical school. Or apply to a physician assistant program.
The OP seems unclear about what he actually wants to do…and how to get there in terms of schooling.