My Take
This site was created to level the playing field, allowing those who couldn't afford more expensive test-prep to receive targeted practice in preparing for common tests like the ACT and the SAT. And it works! Students can avail themselves of programs that quiz them in a variety of different ways, day to day, whole test, and etc.. that can be charted and assessed. Teachers and/or parents can monitor progress and students can be increasingly challenged as they move through the levels. An excellent resource for all!
How I Use It
I use this site/app when students come to me looking for ways to to improve their scores on standardized tests with a simple app that helps them on a day to day basis. I've even used it with my own children and those of my friends. It's a great site.