There are really two different considerations, assuming that your S’s pre-Calculus math has prepared him for AP Calculus:
(1) You want your child’s GC to be able to indicate that he is taking the “most rigorous” academic curriculum offered at his high school. The Common App school report form that is required from the GC clearly asks this question, along with standard “transcript” type items. If AP level Calculus is offered at his high school, he should not be discouraged from taking it or this box doesn’t get checked and it will reflect on your son’s application. Almost every college we visited made a point of clarifying that “rigor” is relative. If your school offers 20 AP classes, the student should be taking a good sampling of them. If your school offers 5 AP classes, it’s a different situation. If your school offers no AP classes, that will not hurt the student so long as he generally takes the most challenging courses.
Here’s the one Duke asks for: http://admissions.duke.edu/images/uploads/process/school_report.pdf
I think it follows the standard format but it’s the one we’re most familiar with.
I suspect your GC is telling him that not taking math senior year will reflect poorly on him when compared to other students in his high school. If he is inclined to take more math, but for some reason does not want to take Calculus, then he might consider AP Stats as his quantitative class.
(2) Does he take AP Calculus AB or BC.
I wanted our D to take AB. Both AB and BC are year-long courses at her high school. But because both are APs, they would carry the same grade point values and meet the rigor. Because it is supposed to cover less material (equivalent to Calc I in college), I thought AB would be a better choice if, for no other reason, she might have less stress during college app season. She insisted that she wanted to take BC. She seems to have a good teacher and is getting more high Bs than low As. Often, I wondered if she should have selected AB, but I did not comment further.
She will be attending Duke and we are looking at math requirements for her intended major through the B.S. route, which requires more math. If she scores a 4 or 5 in BC, she will satisfy her math requirements. She still has to take 2 quantitative courses, but she can take Stats and something else. Had she taken AB and scored sufficiently high, she would still have to take Calculus II. Along with not sloughing off this semester, I know she’ll prepare like mad for the BC test in May. The incentive is there.
So, while it may be early and your S may not yet know his intended major, I recommend that you take a quick look at some of the schools that are on his preliminary list and see how taking either AP Calculus might benefit him.