Which of these comes after Elementary School in the US?

In the U.S., ordinal numbers (e.g., first grade) are used for identifying grades. Typical ages and grade groupings in contemporary, public, and private schools may be found through the U.S. Department of Education. Generally, there are three stages: elementary school (grades K/1–2/3/4/5/6), intermediate school (3/4–5/6), middle school / junior high school (grades 5/6/7–8/9), and high school / senior high school (grades 9/10–12).

Source: Wikipedia