How to prepare for IMO as a math beginner

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I always wanted to solve IMO papers, those always took grabbed my attention, I did some calculus (till basics of multivariable cal, in Khan academy!! (self-taught only)), but, I feel lost right now, I don't know what to proceed next, can someone pls help me (P.S - I am a 15-year-old, who knows only a small fraction of things......, where should I start ?)