Anonymous wrote:It's fine to have gaps. However, there might be other reasons to think about the order. My kid did Bio in 9th and AP Bio in 11th only because that was a particular area of interest (and potential college major). By doing the course in 11th, he had evidence of good grades/good AP score for course in his potential major for college apps, as well as a teacher rec from that teacher. (They get to know them well in a double period!)