SAT - Scholastic Aptitude Test - Sign up for the SAT's and SAT II's. Test
prep and college search engine also. Practice tests and courses!
http://www.collegeboard.com
ACT - Test Information and Preparation - Register and manage account online.
ACT
TOEFL - Test of English as a Foreign Language - Sign up early! Limited
Enrollment!
TOEFL Link
Online SAT Prep Course
SAT Prep
Kaplan - ACT and SAT Test Preparation
Kaplan Test Prep
Online ACT Prep - Practice tests!
ACT Prep