To be eligible to receive the standard Educational Diagnostician Certificate, a candidate must:(1) successfully complete an educational diagnostician preparation program that meets the requirements of §239.82 of this title (relating to Preparation Program Requirements) and §239.83 of this title (relating to Standards Required for the Educational Diagnostician Certificate);(2) successfully complete the examination based on the standards identified in §239.83 of this title;(3) hold, at a minimum, a master's degree from an accredited institution of higher education that at the time was accredited or otherwise approved by an accrediting organization recognized by the Texas Higher Education Coordinating Board;(4) hold a valid classroom teaching certificate; and(5) have three creditable years of teaching experience as a classroom teacher, as defined in Chapter 153, Subchapter CC, of this title (relating to Commissioner's Rules on Creditable Years of Service) and the Texas Education Code, §5.001(2).