Student_RN

Hi guys! I am a Nursing student and I am planning to apply for skilled visa as soon as I finish my studies. In order to secure visa process I would like to get superior English result. Can you please tell me if anyone succeeded to gain all "A" in OET? Is it possible? I prefer this one as it is specific to nursing, but I have some doubts if it is possible to get all As. Or maybe PET is a better choice as it is needed to get more than 79 in all parts which sounds a bit more realistic. Can you please share your experience about these two tests? Thanks!