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A) Obviously, doing a test in an exam-like group setting is much more effective than doing an exam on your own. What's not so obvious is that generic explanations -- ESPECIALLY explanations that are based on inefficient, lower-scoring techniques -- are not as effective a learning tool as a dialogue with a live instructor ,who can address what you specifically did wrong (which may be very different from what other people did wrong) in answering any given Question.

Of course, we also have a library of explanations for every exam that you can access pretty much whenever you like. But that's like eating greasy fast-food when you can have real gour-may cuisine with the finest ingredients. It makes no sense to trade down, and we have those only for those students who can't make it to the live PracTests.