This book has the solutions to many of the world's Mathematical Olympiad problems that, at the time of its publication, have no solutions posted in the web, or its solutions are totally different to help international students to hone their mathematical skills for the dosmetic or international competitions as well as to enhance their general knowledge of mathematics. The problem selections cover varieties of brands of mathematics including geometry, algebra and calculus. Insights are derived from problems wherever possible to further explore the greater depth of mathematics in relation to the problems.