If you are planning to study in the US, you will probably be required to take one or more of the common standardised tests for college admission. Check admissions criteria of the college(s) you intend applying to in order to determine which of the following test(s) you might need to take.
All standardised (entrance) test for US colleges are administered by one of several test companies. Direct any questions about test registration and administration to the test company directly (see links below). If you have more detailed questions about a test, please contact Education USA.