SAT Subject Tests, formerly known as SAT IIs, are shorter and more specialized than the SAT. Each test is comprised of questions pertaining to one course of study, such as Biology, Spanish or History. Subject Tests are an hour in length and follow a multiple-choice format

SAT Subject Tests are required or recommended by many colleges. Some colleges require specific Subject Tests for admission or placement, while others allow you to choose which tests to take. The University of California system, for example, requires two tests from different subject areas: a combination of US History and Math Level 2 tests would be acceptable, however, a combination of US History and World History tests would not be permitted.

In determining which Subject Tests to take, your first step is to contact the admissions offices at your prospective colleges and find out their requirements.