Who can appear for N.I.O.S. secondary exam? Posted on June 7, 2017October 24, 2017 by MREC 0 After completing 14 years of age the student can appear for N.I.O.S. exam. But it depends on the child’s ability to cope up with the syllabus and his intellectual capacity. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.