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/math olympiad/ general

So, I have a cousin who wants to win medals in math competitions, especially IMO. Post resources, guides and tips for olympiads.his prep level: he's 12yo(7th standard), has completed mathematics books upto the 10th standard level. What should be his target next? And how do I help him clear doubts? We don't have decent teachers where we live, and the internet doesn't help much