It doesn't matter. Your score in subject three is recorded in the computer system, and you can make an appointment to take subject four. The signature is just a guarantee to prevent the report from being inconsistent with the results in the system. Your signature means that you agree with the result. This is the role.

If you are not at ease, you can go to the vehicle management office to explain the situation to the police officer and prepare a case. Anyway, your third exam has been recorded and there is evidence.