Resources
There is a lot of material on the World Wide Web. However, to progressively develop skills it is required that material be presented in an organized manner. Following are a few books that cover a good amount of content.
Creative Problem Solving in School Mathematics
By Dr. George Lenchner
The Art of Problem Solving, Volume 1: The Basics
By Sandor Lehoczky and Richard Rusczyk
The Art of Problem Solving, Volume 2: And Beyond
By Richard Rusczyk and Sandor Lehoczky
Both of the two text books can be purchased along with solutions.
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