The school system in America is such that you skip a lot of assignments in math, for example, and simply don't learn them. Teachers know that some assignments can help you solve certain problems in the future, but they still don't want to give them to children to study. I recently found out what do 6th graders learn in math and was surprised that online schools like this have a much more extensive curriculum than the regular schools in your town. So if you want to know better math from a broader base, then enroll or enroll your kids in this online school.