Full Seats for SAT

I’m taking one last SAT so I’m signing up for the October 1st SAT. I saw the location I wanted having seats available but then the next day when I went to pay the seats were full. I was just wondering if seats might become available because there’s still a month left before the normal registration deadline ends. Is it common that a location has seats unavailable for a few days but then is available again due to another proctor being able to monitor the test?

I have not heard of my school ever running out of seats. Do not worry; you can easily take the test at another school. In fact, some students in my school are taking the test at another location so that they do not have to worry about the pressure of having their peers sitting next to them.