My older boy wandered around the Montessori room most of the school day, doing nothing and eventually just doing math. It took me six months to figure this out. The school shrugged their shoulders and said that they "follow the child." They expected him, at age 6, to come in, write up a list of what he wanted to do, and then do it!
Well, he didn't do it! I think he's average in that department. After awhile, I noticed that at least half the kids in their kindergarten level couldn't read; probably kids who didn't right away want to read or gravitate toward that "job.: