Within fifteen days after receipt of notice of revocation or suspension, such person may serve upon the chairman of the State Board of Education or the State Superintendent of Education a written request for either a public or private hearing before the board. The hearing shall be held by the board not less than ten days nor more than twenty days after the request is served, and a notice of the time and place of the hearing shall be given the person not less than four days prior to the date of the hearing. At the hearing, which shall be as summary and as simple as reasonably may be, the parties may appear in person and by counsel, if desired, and may present any testimony, under oath, or other evidence as may be pertinent. Within fifteen days following the hearing, the board shall determine whether there existed just cause for the notice of revocation or suspension and shall render its written order accordingly either affirming, withdrawing, or modifying the notice of revocation or suspension.