Everyone knows how important SAT and ACT scores are. Everyone studies for them somewhat. Here are two sites I used that was the most helpful, and best of all--they are both FREE.
www.number2.com
This is my favorite test review site of all time. It's free and they provide personalized review help for the SAT and ACT and GRE. You create and account and they have tutorials and practice problems. Instant feedback on your progress. Very user friendly interface. They also have a helpful Vocabulary Builder. I suggest that if you are preparing for any of the tests, sign up now and start working.