Each licensee shall annually, before the expiration of the person‘s license, pay to the board the proper fees, together with a certificate showing attendance for a minimum of ten hours of continuing education per calendar year at schools or seminars approved by the board as defined by rule, pertaining to the fitting and sales of hearing instruments, for a renewal of a license. A thirty-day grace period must be allowed after the expiration of a license when a license may be renewed on payment of the proper fees together with the certificate of continuing education to the board. After expiration of the grace period, the board may renew a license upon the payment of the proper fees together with the certificate of continuing education to the board. A licensee who applies for renewal, whose license has expired, may not be required to submit to an examination as a condition to renewal, if the renewal application is made within two years from the date of the expiration and is accompanied with a certificate of continuing education during the twelve months immediately preceding the date of application.