My Brilliant.org levels are very poor (as one can see after visiting my profile!) — so can anybody recommend me an/some Olympiad mathematics books? I specifically need some for Geometry and Combinatorics since I am just level 2 which is not good.
I'd really appreciate it if they help someway in solving Brilliant.org problems. The best resource, I understand, is my thinking. So I'd love it if I get my thinking on the right track.
Addition: The books must be quick reads and interesting... to the point like Brilliant.org blogs :-)
Thank you very much again!