The Zoom link sent to you is an important link that will be used to give you some definite instructions which you could not have gotten anywhere other than the meeting to lead you through the exam proper. However, to be on a safe side, it is advisable that you install zoom app on your phone before that day and endeavour to check and confirm time difference so that you will know the exact time judging by your own local time. Make sure you are online at least 5 mins before the zoom time, read your note and be attentive to every bit of the instructions. With that, I believe you will come out shining. Good luck.