It is not necessary to make an appointment.
Although the interview lasts only a few minutes, the waiting in queues can take all day. You may have to wait up to five hours.
The best time to arrive is between 10:00 a.m. and 10:30 a.m. By then the first wave is almost over and you stand a good chance of being interviewed before lunch.
The interviewer will explain everything you need to know, answer your questions, and provide you with two documents:
a) form for your doctor to fill in
b) fingerprint form, which must be processed on the premises.