Test-preparation links
SAT
http://sat.collegeboard.org/home
Click on "Question of the Day." On the next page, click on "Subscribe" to get a practice SAT question sent to your email every day.
Khan Academy free SAT preparation.
https://www.khanacademy.org/test-prep/sat
ACT
http://www.actstudent.org/
Click on "Test Prep" to find free resources.