***There are Korean (SAT), Intermittent English (SAT), Intermittent Korean History (SAT), Intermittent SAT-Life and Ethics, Social Culture, Korean Geography, World Geography, and Korean Skill Sword, so please use it once!*** ■1. Study automatically! What if I study Korean history automatically every time I turn on my phone? How often do you turn on your phone per day? Checking KakaoTalk, checking Instagram, Facebook, or even subconsciously opening the phone once, but every time you open the pho