> If a US school year is 9 months and the summer vacation is 3 months, it means that every 3 years, a student who only does math in the summer will be accelerat

> If a US school year is 9 months and the summer vacation is 3 months, it means that every 3 years, a student who only does math in the summer will be accelerated by one year. This means that after 9 years of school with math in the summer, the kid (having done no extra work during the school year) will now be radically accelerated. Roughly, this means that in the US math system, they will be taking AP Calculus BC as a Sophomore or Freshman in high school. And this is only doing math in the summertime. Imagine what can happen if your kid does math year-round?!?!?!?! If this is the reason why they are doing it, you are thinking about it the wrong way. What the kids are able to learn in those 9 years, a talented 18 year old (as I guess these kids are) can learn it and understand it better in a few months. Do it because they like it, as if they were playing soccer, but not for acceleration...