We're also in NJ and in one of the best school districts. We have the same problem with DD5 in Kindergarten. Our school also does not have a gifted program. In fact, I heard that most of the best school districts in NJ do not have gifted programs. So it might be better to move to a worse school district if possible. Our school principal is also opposed to grade skipping and is also trying to do in class differentiation. But it's difficult to address the learning needs of far advanced students this way.