My oldest was placed in a class that was too easy for him during his freshman year. It was repetitive and unsurprisingly he was at the top of his class without really trying. During parents weekend the teacher brought up the possibility of his moving up a class but cautioned that he would end up missing some material that his current class addressed later in the year that he had never seen before. So he stayed in that class, got straight As. Our worry was that he would not get to calculus as a result however the school allowed him to take a summer course to cover a requirement and then allowed him to take two math courses the following year which put him a year ahead of our expectations. Having an easy A in math during your freshman year when a child is just getting used to boarding school can be a good thing.