The DHA Exam is a licensing examination, administered by the Dubai Health Authority, for those who want to practice in the emirate of Dubai. To practise in the health sector in Dubai (as a nurse, doctor, dentist, pharmacist, or allied health professional), you need to pass the DHA Exam (or a similar licensing examination) before receiving a DHA licence.
It is an examination of your clinical knowledge, professional abilities, knowledge of UAE healthcare laws and regulations, and your preparedness to practice in the Dubai healthcare setting.
For more info: https://worldedx.com/dha-exam/