This site provides an App for daily PSAT/SAT practice.
Here is the College Board's page on PSAT and PSAT practice tests.
Here are ten full length authentic SAT tests. You must access them through your Khan Academy account.
This is Khan Academy's PSAT practice tests. These should be printed out and taken paper and pencil.
This link is to the Magoosh's full practice test.
This link is to Magoosh's practice question of the day.
This site provides REAL SAT questions/practice tests.
This site has free daily work on the SAT.
This site gives access to questions and answer explanations.
Here is the PSAT Quizlet.