There are many hurdles to jump upon before you appear for the IMO.Preparation for it can be done in various ways like:
- Previous year's question papers for IMO,INMO.(i consider it to be the best resource).
- You can also refer the book by Rajeev Manocha (Buy Indian National Mathematics Olympiad Book Online at Low Prices in India).
- Last but not the least "A hell lot of practice".(You have no idea of the solution now but after half or one hour you surprisingly come up with the solution).
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