Lots of flaws in any curriculum, and depends largely on the teachers implementing it. But the best judge is how many other nationalities flock to its schools. In other words are the Indian schools burdened with long waiting lists of English, American, Canadian, South African, Qatari kids trying to get in to take advantage of a grade curriculum. Or is it the other way around? I am betting that the good British schools are packed full of kids from other nationalities and the they American school has some foreigners.