TONS of bugs! Knowledge checks should be optional, not mandatory, nonexistent even. Aleks has left me to feel so defeated, considering all the bugs. I'll get the problem correct, yet it states that it is incorrect, even my teacher has noticed this. When I do them correct and get them wrong, it causes me to believe I'm doing something incorrect, and I have to in some cases completely re-learn how to solve certain equations that I knew how to do the entire time.