what grade is a junior

In the United States, a junior is a student who is in the 11th grade, which is usually the third year of a students high school period). High school juniors are considered upperclassmen and are advised to prepare for college entrance exams (ACT or SAT) and to start narrowing the list of colleges/universities they want to attend). In some other countries, the term "junior" is also used to refer to a person in the third year at an educational institution, usually at a secondary school or at the college and university level.