If you'd like to get in some extra exam practice before sharpening your No. 2 pencil for the real deal, check out the resources at 4Tests.com. The website, which is partners with Barrons Education, features full-length practice exams for both the SAT and the ACT. If you're not interested in completing a full exam, you can customize the test by selecting the sections you wish to include. 4Tests.com also offers free tutorials on SAT-related areas, such as diction and speed reading.

Plan on taking an Advanced Placement test? Brush up on the essentials with 4Tests.com's practice versions of the biology, chemistry, and U.S. history AP tests. Considering graduate school? Choose from LSAT, MCAT, GMAT, or GRE practice tests. You can even study for your PSAT or your GED. Check out the website for the full library of tests and let us know in the comments about other free online resources you've come across!

For more test prep resources, check out the entire Exam Cram archive.

Hesitant to shell out thousands for a test prep service? Try a free, self-directed program online at TestPrepReview.com. The website features over 30 "self-assessment modules" that cover all the areas you'll be tested on in the SAT. From advanced algebra to sentence flow, each module offers students a taste of and feel for the test. Once you're done correcting your own answers, you can note areas that need improvement and proceed to TestPrepReview.com's "self-improvement directory" for basic resources to help you improve your score.

If you want to do some extra vocabulary work, the website has compiled a list of words frequently found on the SAT and GRE. Print out the words and definitions to memorize on your own time. (You can do the same with their handy list of prefixes and suffixes.) 

For more test prep resources, check out the entire Exam Cram archive.

If you find yourself posting on Facebook instead of finishing your practice test, then you need to check out Kaplan's new online game. The test prep company has found a way to turn everyone's favorite time-waster into a useful study tool. Get competitive with your Facebook friends on Kaplan's SAT QuizBank Challenge. Here you will find a free application that allows you to compete against each other on 3-question challenges everyday. With a 3:45 minute time limit, the game mimics the real SAT, in which test-takers have approximately 75 seconds to answer each question.

It's an effective method if you want to get in some studying every day, but it's in no way a comprehensive preparation. According to college admissions columnist Lauren Starkey, the game "won’t help with reading comprehension, math grid-ins, or essay writing, but ... it does keep you nimble and familiar" with multiple-choice questions in math, critical reading, and writing. You'll also get to read explanations of answers once you're done.

For those after more, Kaplan also offers Spitcabulary, a vocabulary game that helps you bone up on SAT words through an online spitball game involving synonyms and antonyms. For both QuizBank and Spitcabulary, you can compete against other users on Facebook for the highest scores or go solo. Social networking is still mostly time wasted, but at least now, even procrastinators can use Facebook to their academic advantage.