Besides the complete explanations for all GS exam questions, each of the 1400 questions has a discussion thread dedicated to that individual question. So if there was any ambiguity, you will quickly get your answer. Each explanation also comes with references to background information as well as instant video access on that topic. You also have a difficulty icon based on the bell curve. You can see some screen shots here: Practice MCAT Tests (I've waited 3 months for that question! )
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