The Khan Academy and the College Board have teamed-up to help you prepare for the all-important SAT Test. The SAT is one of the most popular tests that colleges and universities use to predict how well you will do in college. (The other popular test is the ACT. Check to see if your college of choice has a preferance). In the past, companies have charged big bucks to prepare you for the test after school and on weekends. Now the Khan Academy and College Board bring you quality test preparation for free and I highly recommend it.
You can login and keep track of your progress. It will help you identify those areas where you need more work and provide videos of how to work through the problems. As usual, everything about the Khan Academy is quality. You can even download a full version of the test to get a feel for how you will score.
I HIGHLY recommend this test prep for the SAT. Here is the link. You can create an account and prepare for the test on YOUR time for FREE.