Hi Cyriel, good luck in the exam, I will try my best and fly, may only be for a short hop due to lack of time:{
Hope it goes better than mine

- probably have to wait another week or so.
Robert, the ranking goes S1 (Student level 1) when you first register, S2 after 10 hours, S3 after a multiple choice exam on the ATC program.
Then it gets more difficult - C1 (Controller 1) after you have passed both a theory paper and a practical exam, C2 after another thoery and practical, and then C3 after another theory and practical. From C3 you can go up to I1 (Instructor 1) by another theory, and TWO practical exams showing you can successfull teach another controller, and evaluate them. I2 require a thoery and a practical also showing you can examine the student. I3 means another thoery, a similar practical, and another practical trainig a C3 to become an I1.
I wrote this out because I am a bit bored, but I will give you a link anyway.
StudentControllerInstructor