Why do you send text messages when your driving test is overdue?

Because the exam results before the expiration date are invalid, you must re-take the exam and pay the fee. According to the "Regulations on the Application and Use of Motor Vehicle Driving License", the provisions are as follows:

The driving skill certificate is valid for three years, and the applicant shall complete the examination of subject 2 and subject 3 within the validity period. If the examination is not completed within the validity period, the scores of subjects that have passed the examination are invalid.