Well, there's this, which comes close: https://www.wiley.com/en-us/The+Art+and+Craft+of+Problem+Solving%2C+3rd+Edition-p-9781119239901 https://www.wiley.com/en

Well, there's this, which comes close: https://www.wiley.com/en-us/The+Art+and+Craft+of+Problem+Solving%2C+3rd+Edition-p-9781119239901 https://www.wiley.com/en-us/The+Art+and+Craft+of+Problem+Sol... Most of the math competitions people are working on are high school math competitions - these have problems from a relatively small set of mathematics, so that high school students can reasonably know the appropriate background.