@Ruth ******
you are confusing TWO very different queue number systems. :/
You get in the main doors at 6 am, you line up in front of the immigration office and at 7 am they bring out a machine that prints queue tickets that shows your place in line OUTSIDE the door. Then you can go do what you want and at 8 they line everyone back up again in the order of your queu ticket so you can get IN the immigration office at 8:30 and get another queue for the section you are needing to get your extension from