lol! Yes, that was pretty much the response by my son’s teachers and therapists at school too! They didnt phrase it quite that way but they got the point across 
Education of your kids is a learning process for the parents as well as the children! My son is so very small and not so very far behind that it made sense to me that he would do well in a younger class…but of course, we did the right thing and advanced him…still in a 12-1-2 class but doing really really well there.
Muzna, as far as Montessori schools, their teaching and curriculum philosophy is more like that of Pak and even Europe…they focus much on academics, learn as much as they can as fast as they can. Public schools tend to foster more creativity and love of learning. Neither is better or worse - its just different and you just need to decide whats best for your gal. There was an interesting article very recently in the Economist written by Queen Rania about education and it touches on those points…let me find the link…