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Why can't I do it? I did it in 80 days, so why can't I do it in 260 days~? Let's start real study with our mouths shut instead of fake study with our mouths open! You can do it until the CSAT in study mode. Fighting! If you want to know more about math teacher Kim Seong-eun? http://bit.ly/megakse Mega Study, the unchangeable law of passing the exam http://www.megastudy.net http://m.megastudy.net