I’m not sure what level of math you’re at, but doing previous IMO problems would presumably be useful; here’s a book containing over 1900, with solutions.
(Btw, the authors’ grasp of English is a little shakey at times, and they rewrote some of the problem statements, so be warned.)
I’m not sure what level of math you’re at, but doing previous IMO problems would presumably be useful; here’s a book containing over 1900, with solutions.
(Btw, the authors’ grasp of English is a little shakey at times, and they rewrote some of the problem statements, so be warned.)