Getting Saudi Driving License from Native Country License

Dear
Today I visited the Khubar driving school, I had my original Pakistani driving license, after paying 100 SAR to registration counter they told me to go for a trial. I went to trial for automatic car where he took my file and kept with him and the police officer told me to reverse the car slowly. Even I have followed all the instructions (Seat belt, Seat adjustment, rear view mirror, hand brake release), he given me red slip on which "taqeem" is written with instruction to go to the school reception. I asked a person he told me that I have done some mistake and you need to pay 330 SAR for taking the classes. Kindly guide me in this case and how to get licence as I cannot take the classes.