WINN

hi all, I am a new member in this forum. I have a question about the job can get a green card after graduation. I have a MS in HRM, but I can not find a job in US. I plan to return to study again with a new major in medical school. But i do not know to be a nurse or a pharmacist can help me get a green card easily and quickly. If you guys have any experience about this concern, pls let me know and I am very appreciated your advice. Thanks a lot