A teacher wishing time off to write university examinations shall do so without being liable to supplying a substitute teacher or payment of such substitute teacher, provided that the teacher shall not be absent for more than one day for each examination and that such examinations be for a course that leads to a higher classification on schedule or directly related to the teacher’s workload as determined by the Principal or Superintendent. A maximum of two (2) days per year will be allowed for this purpose without loss of salary. This clause does not apply for evening examinations unless authorized by the Principal and the Superintendent.