For a growing learner, problem sets are a must to be solved in the field of mathematics. For Math olympiad purposes, we encourage students to practice more. Short time preparation may provide some early achievements, but long time practice will provide inner flourishment. For practicing past problems of BdMO, we compiled a total 551 selected problems from past years. The sorting is done according to the genres of geometry, algebra, counting, combination, number theory and logic. Some basic theories related to the problems are incorporated in this book. Also some useful links are added from different sources to engage more in the learning process. This book can be used as a basic resource for the English version and medium curricula students for their journey in BdMO. Using this book to make a year long practice will help them to make a difference.