... grade-wide pull-out (all the kids from 2nd grade classes were tested for it and the ones who passed are in the group together, pulled out to a different classroom with a special math teacher). I am almost positive other parents do not even know now that their child was tested for this and that the group exists...
Some may complain of the lack of transparency, while others may value it as necessary to preclude wealthier families "prepping" a student for the qualification evaluation... therefore they may see this as the most fair, equal, equitable way to provide access to advanced academics for those students most in need of it. Getting to know the families of other students in the same cluster group of readiness and ability may prove valuable over the years.
... Or parents complain. How come child X is in this program by MY kid is not...
Unfortunately, yes, parents can sometimes be the worst saboteurs of an attempt by a teacher/school/program to serve the varied needs of vastly different gifted kids (mathy, global, etc)
