Anytime you are coming for exam, make sure you are with your faculty receipt, school fees receipt, your course form and clearance print out.
Secondly, If you know that you have bad hairstyle or you are told that your hairstyle is not good, kindly cut it short if not you will not be allowed into exam hall.
Last point mentioned was that, you must dress corporate. combination apart from this will not be allowed into the exam hall.
Thanks.