How many days in advance do I need to cancel the reservation for subject four?

Cancel the reservation of subject 4 at least 1 day in advance. The "Regulations on the Application and Use of Motor Vehicle Driving License" stipulates that if an applicant is unable to take the exam as scheduled for some reason, he shall apply for canceling the appointment one day in advance, and the applicant fails to take the exam as scheduled. If the reservation is cancelled successfully, there are two situations: 1. Only when the reservation application is submitted successfully, there is a cancellation menu on the homepage of the website. If you cancel the reservation according to the prompt, you can cancel the reservation online yourself, and it will be accepted successfully in three to five days. 2. If you have received SMS notification from the vehicle management office that the appointment date is successful, you can only cancel it at the vehicle management office. You need to bring your ID card and file to the vehicle management office to cancel your appointment. Cancellation on the spot takes effect immediately.