Many good points and suggestions have been made. Most boil down to being respectful of the instructor and others in the class.
I once took a class from an internationally known teacher. The first issue was that the facility had us all sitting at round tables, 3 to a table. By the time we set up our sewing machines, we had very little space left for organizing or cutting, which was required throughout the day. The worst, though, was that one of the people at my table had NEVER used a cutting mat or rotary cutter. She needed help every single step of the way. After being shown repeatedly, by the instructor and tablemates, the instructor finally told her that she would do what she could to keep her moving forward, but that the class time was limited and there were steps that all class members needed to get to.