Three students have qualified for the United States Chemistry Olympiad in late April. Andrew Zhou, Gr. 11, scored 58 points out of 60 on a March 27 exam to earn a spot, while Kevin Xu, Gr. 12, scored 57. Because he moved beyond the national round in last year’s competition, Vikram Nathan, Gr. 12, will also compete for Harker, even though each school is typically allowed to enter only two students.