I've wasted my precious time on this program and it didn't even gave me what I wanted. The program just tells you about some random staff and it does not teach you. And those annoying knowledge checks! It's impossible to pass them, because they have nothing in common with the provided information. You also can't move to another topic until you complete it perfectly! If you don't understand something, you have to suffer, because you will but stuck with that topic like forever! I hate this program and I hate that my school is using it! They pay a lot of money for it! I don't understand why our teacher just sits there and does nothing! It is his job to teach us, not this programs job! Useless program!