The SAT is an admissions test administered by College Board and is widely accepted by U.S. colleges and many international colleges and universities. It features three main sections: math, reading, and writing (which includes an optional written essay). 11th and 12th graders typically take the SAT.
The SSAT is a standardized test offered to students who are looking to apply to private schools. The tests are offered for students in three levels: elementary (3rd and 4th graders), middle (5th to 7th graders) and upper (8th to 11th graders). The SSAT covers math, reading, and verbal skills.