Georgia Online Formative Assessment Resource (GOFAR)
https://gofar.gadoe.org/GOFARWeb
Milestones test practice - MUST use the Chrome browser:
http://www.gaexperienceonline.com/
SAT practice tests:
https://collegereadiness.collegeboard.org/sat/practice
Khan Academy SAT Preparation
https://www.khanacademy.org/sat
Encourage your students to explore Official SAT Practice on Khan Academy®. On this site students can get free, personalized SAT® study plans that support what they're learning in class.
PSAT practice test:
https://collegereadiness.collegeboard.org/psat-nmsqt-psat-10/practice
ACT prep and sample test questions:
http://www.act.org/content/act/en/products-and-services/the-act/test-preparation.html