ALEKS
Provides a complete web based educational environment for K-12 and Higher-Education mathematics, accounting, statistics, and chemistry.
The biggest problem with ALEKS is the fact that they make you go back and review prerequisite materials before allowing you to access the course you have signed up for. If you make even one minor mistake on any problem they make you do numerous problems of the same type. This seems to be designed to keep you subscribed and paying for an extensive amount of time. Note that I completed beginning and intermediate algebra with ALEKS and received ACE credit. I took College Algebra at a university. I want to take trigonometry only, but cannot do so without retaking all prerequisite material with perfect scores. I have spoken to them and there is no way to waive this unless, I believe, you are a college or high school instructor using their materials. As a home school student, my parent was not able to do this. It is possible to understand prerequisite coursework thoroughly and make a minor mistake here and there. This is why I stopped subscribing and will not do so again. If this method were followed in college or high school (needing a perfect score on prerequisites) it is unlikely that most students would ever progress. ALEKS should realize that this method is a transparent way to keep subscribers paying for an extended amount of time. However, they are losing customers due to this policy. They will find numerous reasons to defend this from an academic standpoint, but after subscribing for several courses and completing two, I am no longer deceived.