The International Mathematical Olympiad (IMO) is the World Math Competition for high school students and is held annually in a different country, establishing itself as the most prestigious Math competition that a high school student can aspire to take part. The first IMO was held in 1959 in Romania, with 7 participating countries. Since then, it has gradually expanded to more than 100 countries on 5 continents. Likewise, the IMO is a great opportunity for students to face original, challenging and interesting math problems; which can be used to measure their level of knowledge to other students around the world. Among the topics covered by the problems we have: Algebra, Combinatorics, Geometry and Number Theory. On this occasion we make available to the student, a bilingual edition (English-Spanish) of the exam with detailed solutions of the 61th International Mathematical Olympiad held virtually from Saint Petersburg - Russia in September 2020. In addition, an appendix with problem statements from IMO exams between 2010 and 2019 are included.