SAT

Test Prep: https://collegereadiness.collegeboard.org/sat

SAT Question of the Day: https://collegereadiness.collegeboard.org/sat/practice/daily-practice-app

Khan Academy Test Prep: https://www.khanacademy.org/test-prep/sat

ACT 

Test Prep: https://pages.act.org/free-practice-act-test.html

Free Practice Test: https://www.princetonreview.com/college/free-act-practice-test#!practice

ACT Question of the Day: http://kaplanquizzes.com