This was formerly know as the Achievement Tests and was renamed the SAT II: Subject Tests. They are administered by the College Board and widely used as a college entrance exam. Students may take the test more than once, but only the highest score is reported at the year of graduation.
See Scholastic Assessment Test II.
One-hour tests measuring knowledge and ability that apply to knowledge in specific subject areas. Three tests possible on each test date. Many 4-year colleges require three SAT II tests; usually English, mathematics and a third of the student’s choice. The SAT II is offered on the same day as SAT I, but both may not be taken on the same day.
The SAT IIs assess knowledge in various high school subject areas. Most colleges require the Writing test, some version of the Math test, and a foreign language test. Even colleges that don't require the SAT IIs will usually review the scores as additional info about a student's abilities. Students tackle these tests in the spring of junior year and the fall of senior year. If the test is linked to a specific subject like Chemistry, it's best to take the test as soon as possible upon the completion of the course.
Subject tests, often required by highly selective colleges. Score range 200-800 in individual subjects.
A standardized subject test measuring competence in a specific area (Biology, French, etc.)