Students can take the International History Olympiad Qualifying Exam at this link. The exam is now open and costs 20 USD.
For students within the USA, they must score 75 or higher if they take the exam while in 9th-12th grade, 65 or higher if they take the exam while in 7th or 8th grade, 55 or higher if they take the exam while in 2nd-6th grade. Students are considered to be in their grade that they were in during the 2024-25 academic year until the end of that day, and thenceforth in their subsequent grade.
For students outside the USA, they must score 75 or higher if they were born on or before August 31, 2010, 65 or higher if they were born between September 1, 2010 and August 31, 2012, and 55 or higher if they were born on or after September 1, 2012.