If you are not a health professional trying to register in an English-speaking milieu, OET is not at all a suitable English language test for you.
OET is an English language exam to assess the language speaking and communication skills of healthcare professionals wanting to fit into an English-speaking background. It aims to concentrate on the health professionals’ communication requirements in workplaces and to offer a valid and trustworthy assessment of English language skills in that environment. Supervisory authorities who acknowledge OET as proof of proficiency in the English language do so to meet those requirements.
It is better if you consult the related governing authorities before you decide to register for this test. Identify who recognizes OET.