If your child has enjoyed science "outside school", no doubt he is very ahead. when we were in Austin, there was a science curriculum and a very difficult TAKS (state standard) exam in 5th and 8th. I complained that there was not enough science until 5th grade.
Then, we moved to Colorado where science is only covered during "literacy time" - that means that they read about it occasionally.
Other countries have better science curriculums and it is not shocking that they excel in this. Young children love science and this is a good time to introduce them.
