My children used to come home with a tin of words within 2 weeks of starting at age 5. They had to learn the words which were in a book that they were expected to read in school. We had no problem with this as the school they attended had/has an excellent reputation. We seemed to have time for all the 'family' things- swimming 3 times a week, table tennis, visiting relatives (incidentally the grandparents were very good at engaging the children in numbers games, word games etc.) Unless you can get all the other parents in the class to boycott, or complain, about the hw, your child is going to 'fall behind'... Also bear in mind that there are a fair few parents out there who are using tutors and Kumon at an early age.