I would like to suggest the following books from http://www.artofproblemsolving.com/Books/AoPS_B_Texts_FAQ.ph... Start with following two books the Art of Problem Solving, Volume 1: the Basics the Art of Problem…
I would like to suggest the following books from http://www.artofproblemsolving.com/Books/AoPS_B_Texts_FAQ.ph... Start with following two books the Art of Problem Solving, Volume 1: the Basics the Art of Problem…