Test Prep - Free Sites

​Peterson's Test Prep: (make an account/no email required!)
SAT, ACT, and AP tests
  • Full-length, timed, and free practice exams that simulate the actual testing experience for AP, ACT, SAT, PSAT, GED and more.
  • Prep for vocational exams
  • ​Explore career options
  • Find schools and scholarships

Khan Academy
SAT (Math, Reading, Writing)
If you’re taking the SAT soon, you can start preparing today with questions from real SATs.  Download a real, full-length SAT practice test, watch Sal work through real SAT problems, and get even more practice using their interactive exercises.
 
ACT - Official Website
The official ACT website, actstudent.org, is not just a place to take care of ACT logistics, such as signing up for the test and getting your scores. You can also find sample questions, sample student essays, college admissions planning advice, and a full-length ACT practice test PDF made up of real ACT questions that are no longer in use. 
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College Board's Full Practice Test
SAT (Math, Reading, Writing)
Offers the official 2013-14 SAT practice test but then wants to sell additional SAT practice tests.  Best when used in conjunction with some of the other SAT preparation sites discussed below.

University HQ
University Headquarters (UniversityHQ) helps find top rated colleges, scholarships, potential salaries and careers. Also offers SAT/ACT prep resource guide.
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March 2 Success
SAT (Math, Reading, Writing), ACT (Math, Reading, Writing)
This site, a collaboration of the U.S. Army and the publishers of Peterson Guides, offers seven full-length practice tests and 25 decks of flash cards.

ProProfs: Build and Test Knowledge
SAT (Math, Reading, Writing)
Claiming to have the most comprehensive collection of free SAT study resources online, this site provides practice exams, flash cards, quizzes, and cram sheets.

Study Guide Zone
SAT (Math, Reading, Writing)
Focusing on improving standardized-test score, this site covers a wide variety of standard college and professional tests.  In addition to the SAT study guide, test flash cards, and practice questions, there is a "College Tips" advice section.