International Mathematical Olympiad selection process Olympiad. Although in principle students of the lower levels may be selected to go to the IMO, it generally takes many years before they can compete with students of the highest level or nivel superior. After the National Competition the twenty best students of each level are invited to the June Training Session where students undergo the IMO selection process. "Hrvatsko matematičko društvo" invites about 20 contestants who performed best at the national level (national level competition is separated by age) to the Croatian Mathematical Olympiad ("Hrvatska matematička olimpijada", HMO) which consists of 2 days, 4 problems each. The best
Science Olympiad for following years than pilot events. Almost all of the Trial events from recent National tournaments have become official events within a few years of the tournament, while the same is not true for almost any of the pilot events. Teams are hosted by the school from which the participants attend. Science Olympiad is most often run as an after-school extracurricular activity, but some schools offer Science Olympiad classes that allow students to receive academic credit for participation. A teacher, parent, or student (usually a volunteer) coordinates the team in practice and preparation for the competition. Often there are others