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I took a course for free but they still made me pay for the books ($250), which I think was kind of rude. Within my office, I taught more subjects than any other teacher, and I taught the largest number of most courses and tutorials. I singlehandedly represented a HUGE share of all business that ran through my office each year.
The discount is on the prep classes. I don't take perp classes anymore
If you're interested in taking a standardized testing class, they offer those classes for free.