If you were in the US, which school and grade would you be in?

Based on the provided table, if you were in the US and aiming for a typical high school experience, you would be in High School, grades 9-12, for ages 14-18. If you were younger, you would be in Elementary School (grades 1-5, ages 6-11) or Middle School (grades 6-8, ages 11-14).